Incest is sexual activity between family members or close relatives. This typically includes sexual activity between people in a consanguineous relationship (blood relations), and sometimes those related by affinity, stepfamily, those related by adoption or marriage, or members of the same clan or lineage.
The incest taboo is and has been one of the most widespread of all cultural taboos, both in present and in many past societies. Most modern societies have laws regarding incest or social restrictions on closely consanguineous marriages. In societies where it is illegal, consensual adult incest is seen by some as a victimless crime. Some cultures extend the incest taboo to relatives with no consanguinity such as milk-siblings, stepsiblings, and adoptive siblings. Third-degree relatives (such as half-aunt, half-nephew, first cousin) on average share 12.5% genes, and sexual relations between them is viewed differently in various cultures, from being discouraged to being socially acceptable. The children of incestuous relationships were regarded as illegitimate, and are still so regarded in some societies today. In most cases, the parents did not have the option to marry to remove that status, as incestuous marriages were, and are, normally also prohibited.
A common justification for prohibiting incest is avoiding inbreeding: a collection of genetic disorders suffered by the children of parents with a close genetic relationship. Such children are at greater risk for congenital disorders, death, and developmental and physical disability, and that risk is proportional to their parents' coefficient of relationship—a measure of how close the parents are related genetically. But inbreeding is not the sole basis for the incest taboo for two reasons. First, most prohibitions on incest cover affinity relationships—that is, relationships created by marriage (for example, father-in-law and stepfather)—as well as relationships created by adoption. And second, the incest taboo also applies to non-procreative sex—for example, sex between infertile relatives, relatives of the same sex, or sex performed with birth control.
In some societies, such as those of Ancient Egypt and others, brother–sister, father–daughter, mother–son, cousin–cousin, aunt–nephew, uncle–niece, and other combinations of relations were practiced among royalty as a means of perpetuating the royal lineage. Some societies, such as the Balinese and some Inuit tribes, have different views about what constitutes illegal and immoral incest. However, sexual relations with a first-degree relative (such as a parent or sibling) are almost universally forbidden.
The English word incest is derived from the Latin incestus, which has a general meaning of "impure, unchaste". It was introduced into Middle English, both in the generic Latin sense (preserved throughout the Middle English period) and in the narrow modern sense. The derived adjective incestuous appears in the 16th century. Before the Latin term came in, incest was known in Old English as sib-leger (from sibb 'kinship' + leger 'to lie') or mǣġhǣmed (from mǣġ 'kin, parent' + hǣmed 'sexual intercourse') but in time, both words fell out of use. Terms like incester and incestual have been used to describe those interested or involved in sexual relations with relatives among humans, while inbreeder has been used in relation to similar behavior among non-human animals or organisms.
In ancient China, first cousins with the same surnames (i.e., those born to the father's brothers) were not permitted to marry, while those with different surnames (i.e., maternal cousins and paternal cousins born to the father's sisters) were.
Several of the Egyptian Pharaohs married their siblings and had several children with them. For example, Tutankhamun married his half-sister Ankhesenamun, and was himself the child of an incestuous union between Akhenaten and an unidentified sister-wife. It is now generally accepted that sibling marriages were widespread among all classes in Egypt during the Graeco-Roman period. Numerous papyri and the Roman census declarations attest to many husbands and wives being brother and sister, of the same father and mother. The most famous of these relationships were in the Ptolemaic royal family; Cleopatra VII was married to her younger brother, Ptolemy XIII, while her mother and father, Cleopatra V and Ptolemy XII, had also been brother and sister.
The fable of Oedipus, with a theme of inadvertent incest between a mother and son, ends in disaster and shows ancient taboos against incest as Oedipus is punished for incestuous actions by blinding himself. In the "sequel" to Oedipus, Antigone, his four children are also punished for their parents' incestuousness. Incest appears in the commonly accepted version of the birth of Adonis, when his mother, Myrrha has sex with her father Cinyras during a festival, disguised as a prostitute.
In Ancient Greece, Spartan King Leonidas I, hero of the legendary Battle of Thermopylae, was married to his niece Gorgo, daughter of his half-brother Cleomenes I. Greek law allowed marriage between a brother and sister if they had different mothers. For example, some accounts say that Elpinice was for a time married to her half-brother Cimon.
Roman civil law prohibited marriages within four degrees of consanguinity but had no degrees of affinity with regards to marriage. Roman civil laws prohibited any marriage between parents and children, either in the ascending or descending line ad infinitum. Adoption was considered the same as affinity in that an adoptive father could not marry an unemancipated daughter or granddaughter even if the adoption had been dissolved. Incestuous unions were discouraged and considered nefas (against the laws of gods and man) in ancient Rome. In AD 295 incest was explicitly forbidden by an imperial edict, which divided the concept of incestus into two categories of unequal gravity: the incestus iuris gentium, which was applied to both Romans and non-Romans in the Empire, and the incestus iuris civilis, which concerned only Roman citizens. Therefore, for example, an Egyptian could marry an aunt, but a Roman could not. Despite the act of incest being unacceptable within the Roman Empire, Roman Emperor Caligula is rumored to have had sexual relationships with all three of his sisters (Julia Livilla, Drusilla, and Agrippina the Younger). Emperor Claudius, after executing his previous wife, married his brother's daughter Agrippina the Younger, and changed the law to allow an otherwise illegal union. The law prohibiting marrying a sister's daughter remained. The taboo against incest in Ancient Rome is demonstrated by the fact that politicians would use charges of incest (often false charges) as insults and means of political disenfranchisement.
In Norse mythology, there are themes of brother-sister marriage, a prominent example being between Njörðr and his unnamed sister (perhaps Nerthus), parents of Freyja and Freyr. Loki in turn also accuses Freyja and Freyr of having a sexual relationship.
According to Genesis 20:12 of the Hebrew Bible, the Patriarch Abraham and his wife Sarah were half-siblings, both being children of Terah, but with different mothers. According to 2 Samuel, Amnon, King David's son, raped his half-sister, Tamar (2 Samuel 13).
In Genesis 19:30-38, living in an isolated area after the destruction of Sodom and Gomorrah, Lot's two daughters conspired to inebriate and seduce their father due to the lack of available partners to continue his line of descent. Because of intoxication, Lot "perceived not" when his firstborn, and the following night his younger daughter, lay with him. (Genesis 19:32-35)
From the Middle Ages onwardEdit
Many European monarchs were related due to political marriages, sometimes resulting in distant cousins (and even first cousins) being married. This was especially true in the Habsburg, Hohenzollern, Savoy and Bourbon royal houses. However, relations between siblings, which may have been tolerated in other cultures, were considered abhorrent. For example, the accusation that Anne Boleyn and her brother George Boleyn had committed incest was one of the reasons that both siblings were executed in May 1536.
Incestuous marriages were also seen in the royal houses of ancient Japan and Korea, Inca Peru, Ancient Hawaii, and, at times, Central Africa, Mexico, and Thailand. Like the pharaohs of ancient Egypt, the Inca rulers married their sisters. Huayna Capac, for instance, was the son of Topa Inca Yupanqui and the Inca's sister and wife.
Half-sibling marriages were found in ancient Japan such as the marriage of Emperor Bidatsu and his half-sister Empress Suiko. Japanese Prince Kinashi no Karu had sexual relationships with his full sister Princess Karu no Ōiratsume, although the action was regarded as foolish. In order to prevent the influence of the other families, a half-sister of Korean Goryeo Dynasty monarch Gwangjong became his wife in the 10th century. Her name was Daemok. Brother-sister marriages were common during some Roman periods as some census records have shown.
Prevalence and statisticsEdit
Incest between an adult and a person under the age of consent is considered a form of child sexual abuse that has been shown to be one of the most extreme forms of childhood abuse; it often results in serious and long-term psychological trauma, especially in the case of parental incest. Its prevalence is difficult to generalize, but research has estimated 10–15% of the general population as having at least one such sexual contact, with less than 2% involving intercourse or attempted intercourse. Among women, research has yielded estimates as high as 20%.
Father-daughter incest was for many years the most commonly reported and studied form of incest. More recently, studies have suggested that sibling incest, particularly older brothers having sexual relations with younger siblings, is the most common form of incest, with some studies finding sibling incest occurring more frequently than other forms of incest. Some studies suggest that adolescent perpetrators of sibling abuse choose younger victims, abuse victims over a lengthier period, use violence more frequently and severely than adult perpetrators, and that sibling abuse has a higher rate of penetrative acts than father or stepfather incest, with father and older brother incest resulting in greater reported distress than stepfather incest.
Between adults and childrenEdit
Sex between an adult family member and a child is usually considered a form of child sexual abuse and for many years has been the most reported form of incest. Father–daughter and stepfather–stepdaughter sex is the most commonly reported form of adult-child incest, with most of the remaining involving a mother or stepmother. Many studies found that stepfathers tend to be far more likely than biological fathers to engage in this form of incest. One study of adult women in San Francisco estimated that 17% of women were abused by stepfathers and 2% were abused by biological fathers. Father–son incest is reported less often, but it is not known how close the frequency is to heterosexual incest because it is likely more under-reported. Prevalence of incest between parents and their children is difficult to assess due to secrecy and privacy.
In a 1999 news story, BBC reported, "Close-knit family life in India masks an alarming amount of sexual abuse of children and teenage girls by family members, a new report suggests. Delhi organisation RAHI said 76% of respondents to its survey had been abused when they were children—40% of those by a family member."
According to the National Center for Victims of Crime a large proportion of rape committed in the United States is perpetrated by a family member:
Research indicates that 46% of children who are raped are victims of family members (Langan and Harlow, 1994). The majority of American rape victims (61%) are raped before the age of 18; furthermore, 29% of all rapes occurred when the victim was less than 11 years old. 11% of rape victims are raped by their fathers or stepfathers, and another 16% are raped by other relatives.
A study of victims of father–daughter incest in the 1970s showed that there were "common features" within families before the occurrence of incest: estrangement between the mother and the daughter, extreme paternal dominance, and reassignment of some of the mother's traditional major family responsibility to the daughter. Oldest and only daughters were more likely to be the victims of incest. It was also stated that the incest experience was psychologically harmful to the woman in later life, frequently leading to feelings of low self-esteem, very unhealthy sexual activity, contempt for other women, and other emotional problems.[clarification needed (needs a better source)]
Adults who as children were incestuously victimized by adults often suffer from low self-esteem, difficulties in interpersonal relationships, and sexual dysfunction, and are at an extremely high risk of many mental disorders, including depression, anxiety disorders, phobic avoidance reactions, somatoform disorder, substance abuse, borderline personality disorder, and complex post-traumatic stress disorder. Research by Leslie Margolin indicates that mother-son incest does not trigger some innate biological response, but that the effects are more directly related to the symbolic meanings attributed to this act by the participants.
The Goler clan in Nova Scotia is a specific instance in which child sexual abuse in the form of forced adult/child and sibling/sibling incest took place over at least three generations. A number of Goler children were victims of sexual abuse at the hands of fathers, mothers, uncles, aunts, sisters, brothers, cousins, and each other. During interrogation by police, several of the adults openly admitted to engaging in many forms of sexual activity, up to and including full intercourse, multiple times with the children. Sixteen adults (both men and women) were charged with hundreds of allegations of incest and sexual abuse of children as young as five. In July 2012, twelve children were removed from the 'Colt' family (a pseudonym) in New South Wales, Australia, after the discovery of four generations of incest. Child protection workers and psychologists said interviews with the children indicated "a virtual sexual free-for-all".
In Japan, there is a popular misconception that mother-son incestuous contact is common, due to the manner in which it is depicted in the press and popular media. According to Hideo Tokuoka, "When Americans think of incest, they think of fathers and daughters; in Japan one thinks of mothers and sons" due to the extensive media coverage of mother-son incest there. Some western researchers assumed that mother-son incest is common in Japan, but research into victimization statistics from police and health-care systems discredits this; it shows that the vast majority of sexual abuse, including incest, in Japan is perpetrated by men against young girls.
Between childhood siblingsEdit
Childhood sibling–sibling incest is considered to be widespread but rarely reported. Sibling-sibling incest becomes child-on-child sexual abuse when it occurs without consent, without equality, or as a result of coercion. In this form, it is believed to be the most common form of intrafamilial abuse. The most commonly reported form of abusive sibling incest is abuse of a younger sibling by an older sibling. A 2006 study showed a large portion of adults who experienced sibling incest abuse have "distorted" or "disturbed" beliefs (such as that the act was "normal") both about their own experience and the subject of sexual abuse in general.
Sibling abusive incest is most prevalent in families where one or both parents are often absent or emotionally unavailable, with the abusive siblings using incest as a way to assert their power over a weaker sibling. Absence of the father in particular has been found to be a significant element of most cases of sexual abuse of female children by a brother. The damaging effects on both childhood development and adult symptoms resulting from brother–sister sexual abuse are similar to the effects of father–daughter, including substance abuse, depression, suicidality, and eating disorders.
Between consenting adultsEdit
Sexual activity between adult close relatives is sometimes ascribed to genetic sexual attraction. This form of incest has not been widely reported, but evidence has indicated that this behavior does take place, possibly more often than many people realize. Internet chatrooms and topical websites exist that provide support for incestuous couples.
Proponents of incest between consenting adults draw clear boundaries between the behavior of consenting adults and rape, child molestation, and abusive incest. The law struggles to accept the existence of consensual sibling-sibling sexual relationships. As the legal system does not deal with moral issues on a continuum, these cases are divided into categories or binaries. This is why, even consensual relationships such as these, are still classified as "incest". James Roffee, a senior lecturer in criminology at Monash University and former worker on legal responses to familial sexual activity in England and Wales, and Scotland, discussed how the European Convention on Human Rights deems all familial sexual acts to be criminal, even if all parties give their full consent and are knowledgeable to all possible consequences. He also argues that the use of particular language tools in the legislation manipulates the reader to deem all familial sexual activities as immoral and criminal, even if all parties are consenting adults. According to one incest participant who was quoted for an article in The Guardian:
You can't help who you fall in love with, it just happens. I fell in love with my sister and I'm not ashamed ... I only feel sorry for my mom and dad, I wish they could be happy for us. We love each other. It's nothing like some old man who tries to fuck his three-year-old, that's evil and disgusting ... Of course we're consenting, that's the most important thing. We're not fucking perverts. What we have is the most beautiful thing in the world.
In Slate, William Saletan drew a legal connection between gay sex and incest between consenting adults. As he described in his article, in 2003, U.S. Senator Rick Santorum commented on a pending U.S. Supreme Court case involving sodomy laws (primarily as a matter of Constitutional rights to Privacy and Equal Protection under the Law):
"If the Supreme Court says that you have the right to consensual sex within your home, then you have the right to bigamy, you have the right to polygamy, you have the right to incest, you have the right to adultery."
However, David Smith of the Human Rights Campaign professed outrage that Santorum placed being gay on the same moral and legal level as someone engaging in incest. Saletan argued that, legally and morally, there is essentially no difference between the two, and went on to support incest between consenting adults being covered by a legal right to privacy. UCLA law professor Eugene Volokh has made similar arguments. In a more recent article, Saletan said that incest is wrong because it introduces the possibility of irreparably damaging family units by introducing "a notoriously incendiary dynamic—sexual tension—into the mix".
Aunts, uncles, nieces or nephewsEdit
In the Netherlands, marrying one's nephew or niece is legal, but only with the explicit permission of the Dutch Government, due to the possible risk of genetic defects among the offspring. Nephew-niece marriages predominantly occur among foreign immigrants. In November 2008, the Christian Democratic (CDA) party's Scientific Institute announced that it wanted a ban on marriages between nephews and nieces.
Consensual sex between adults (persons of 18 years and older) is always lawful in the Netherlands and Belgium, even among closely related family members. Sexual acts between an adult family member and a minor are illegal, though they are not classified as incest, but as abuse of the authority such an adult has over a minor, comparable to that of a teacher, coach or priest.
In Florida, consensual adult sexual intercourse with someone known to be your aunt, uncle, niece or nephew constitutes a felony of the third degree. Other states also commonly prohibit marriages between such kin. The legality of sex with a half-aunt or half-uncle varies state by state.
In the United Kingdom, incest includes only sexual intercourse with a parent, grandparent, child or sibling, but the more recently introduced offence of "sex with an adult relative" extends also as far as half-siblings, uncles, aunts, nephews and nieces. The term 'incest' however remains widely used in popular culture to describe any form of sexual activity with a relative.
Between adult siblingsEdit
The most public case of consensual adult sibling incest in recent years is the case of a brother-sister couple from Germany, Patrick Stübing and Susan Karolewski. Because of violent behavior on the part of his father, Patrick was taken in at the age of 3 by foster parents, who adopted him later. At the age of 23 he learned about his biological parents, contacted his mother, and met her and his then 16-year-old sister Susan for the first time. The now-adult Patrick moved in with his birth family shortly thereafter. After their mother died suddenly six months later, the siblings became intimately close, and had their first child together in 2001. By 2004, they had four children together: Eric, Sarah, Nancy, and Sofia. The public nature of their relationship, and the repeated prosecutions and even jail time they have served as a result, has caused some in Germany to question whether incest between consenting adults should be punished at all. An article about them in Der Spiegel states that the couple are happy together. According to court records, the first three children have mental and physical disabilities, and have been placed in foster care. In April 2012, at the European Court of Human Rights, Patrick Stübing lost his case that the conviction violated his right to a private and family life. On September 24, 2014 the German Ethics Council has recommended that the government abolish laws criminalizing incest between siblings, arguing that such bans impinge upon citizens.
Marriages and sexual relationships between first cousins are stigmatized as incest in some cultures, but tolerated in much of the world. Currently, 24 US states prohibit marriages between first cousins, and another seven permit them only under special circumstances. The United Kingdom permits both marriage and sexual relations between first cousins.
First- and second-cousin marriages are rare, accounting for less than 1% of marriages in Western Europe, North America and Oceania, while reaching 9% in South America, East Asia and South Europe and about 50% in regions of the Middle East, North Africa and South Asia.[dubious ] Communities such as the Dhond and the Bhittani of Pakistan clearly prefer marriages between cousins as belief they ensure purity of the descent line, provide intimate knowledge of the spouses, and ensure that patrimony will not pass into the hands of "outsiders".
There are some cultures in Asia which stigmatize cousin marriage, in some instances even marriages between second cousins or more remotely related people. This is notably true in the culture of Korea. In South Korea, before 1997, anyone with the same last name and clan were prohibited from marriage. In light of this law being held unconstitutional, South Korea now only prohibits up to third cousins (see Article 809 of the Korean Civil Code). Hmong culture prohibits the marriage of anyone with the same last name – to do so would result in being shunned by the entire community, and they are usually stripped of their last name. Some Hindu communities in India prohibit cousin marriages.
In a review of 48 studies on the children parented by cousins, the rate of birth defects was twice that of non-related couples: 4% for cousin couples as opposed to 2% for the general population.
Defined through marriageEdit
Some cultures include relatives by marriage in incest prohibitions; these relationships are called affinity rather than consanguinity. For example, the question of the legality and morality of a widower who wished to marry his deceased wife's sister was the subject of long and fierce debate in the United Kingdom in the 19th century, involving, among others, Matthew Boulton and Charles La Trobe. The marriages were entered into in Scotland and Switzerland respectively, where they were legal. In medieval Europe, standing as a godparent to a child also created a bond of affinity. But in other societies, a deceased spouse's sibling was considered the ideal person to marry. The Hebrew Bible forbids a man from marrying his brother's widow with the exception that, if his brother died childless, the man is instead required to marry his brother's widow so as to "raise up seed to him" (per Deuteronomy 25:5–6).
In Islamic law, marriage among close blood relations like parents, stepparent, parents in-law, siblings, stepsiblings, the children of siblings, aunts and uncles is prohibited, while first or second cousins may marry. Marrying the widow of a brother, or the sister of deceased or divorced wife is also allowed.
Offspring of biologically related parents are subject to the possible impact of inbreeding. Such offspring have a higher possibility (see Coefficient of relationship) of congenital birth defects because it increases the proportion of zygotes that are homozygous for deleterious recessive alleles that produce such disorders (see Inbreeding depression). Because most such alleles are rare in populations, it is unlikely that two unrelated marriage partners will both be heterozygous carriers. However, because close relatives share a large fraction of their alleles, the probability that any such rare deleterious allele present in the common ancestor will be inherited from both related parents is increased dramatically with respect to non-inbred couples. Contrary to common belief, inbreeding does not in itself alter allele frequencies, but rather increases the relative proportion of homozygotes to heterozygotes. However, because the increased proportion of deleterious homozygotes exposes the allele to natural selection, in the long run its frequency decreases more rapidly in inbred population. In the short term, incestuous reproduction is expected to produce increases in spontaneous abortions of zygotes, perinatal deaths, and postnatal offspring with birth defects. This also means that the closer two persons are related, the more severe are the biological costs of inbreeding. This fact likely explains why inbreeding between close relatives, such as siblings, is less common than inbreeding between cousins.
There may also be other deleterious effects besides those caused by recessive diseases. Thus, similar immune systems may be more vulnerable to infectious diseases (see Major histocompatibility complex and sexual selection).
A 1994 study found a mean excess mortality with inbreeding among first cousins of 4.4%. Children of parent-child or sibling-sibling unions are at increased risk compared to cousin-cousin unions. Studies suggest that 20-36% of these children will die or have major disability due to the inbreeding. A study of 29 offspring resulting from brother-sister or father-daughter incest found that 20 had congenital abnormalities, including four directly attributable to autosomal recessive alleles.
Many mammal species, including humanity's closest primate relatives, tend to avoid mating with close relatives, especially if there are alternative partners available. However, some chimpanzees have been recorded attempting to mate with their mothers. Male rats have been recorded engaging in mating with their sisters, but they tend to prefer non-related females over their sisters.
Livestock breeders often practice controlled breeding to eliminate undesirable characteristics within a population, which is also coupled with culling of what is considered unfit offspring, especially when trying to establish a new and desirable trait in the stock.
Laws regarding sexual activity between close relatives vary considerably between jurisdictions, and depend on the type of sexual activity and the nature of the family relationship of the parties involved, as well as the age and sex of the parties. Prohibition of incest laws may extend to restrictions on marriage rights, which also vary between jurisdictions. Most jurisdictions prohibit parent-child and sibling marriages, while other also prohibit first-cousin and uncle-niece and aunt-nephew marriages. In most places, incest is illegal, regardless of the ages of the two partners. In other countries, incestuous relationships between consenting adults (with the age varying by location) are permitted, including in the Netherlands, France, Slovenia and Spain. Sweden is the only country that allows marriage between half-siblings and they must seek government counseling before marriage.
While the legality of consensual incest varies by country, sexual assault committed against a relative is usually seen as a very serious crime. In some legal systems, the fact of a perpetrator being a close relative to the victim constitutes an aggravating circumstance in the case of sexual crimes such as rape and sexual conduct with a minor – this is the case in Romania.
According to the Torah, per Leviticus 18, "the children of Israel"—Israelite men and women alike—are forbidden from sexual relations between people who are "near of kin" (cf. verse 6), who are defined as:
- Parents and children (cf. verse 7)
- Siblings and half siblings (cf. verses 9 and 11). Relationships between these are particularly singled out for a curse in Deuteronomy 27, and they are of the only two kinds incestuous relationships that are among the particularly-singled-out relationships—with the other particularly-singled-out relationships being ones of non-incestuous family betrayal (cf. verse 20) and bestiality (cf. verse 21)
- Grandparents and grandchildren (cf. verse 10)
- Aunts and nephews, uncles and nieces, etc. (cf. verses 12–14). Relationships between these are the second kind of relationships that are particularly singled out for a curse in Deuteronomy 27, and the explicit examples of children-in-law and mothers-in-law (cf. verse 23) serves to remind the Israelites that the parents-in-law are also (or at least should be also) the children-in-laws' aunts and uncles:
And Moses commanded the children of Israel according to the word of the LORD, saying: 'The tribe of the sons of Joseph speaketh right. This is the thing which the LORD hath commanded concerning the daughters of Zelophehad, saying: Let them be married to whom they think best; only into the family of the tribe of their father shall they be married. So shall no inheritance of the children of Israel remove from tribe to tribe; for the children of Israel shall cleave every one to the inheritance of the tribe of his fathers. And every daughter, that possesseth an inheritance in any tribe of the children of Israel, shall be wife unto one of the family of the tribe of her father, that the children of Israel may possess every man the inheritance of his fathers. So shall no inheritance remove from one tribe to another tribe; for the tribes of the children of Israel shall cleave each one to its own inheritance.' Even as the LORD commanded Moses, so did the daughters of Zelophehad. For Mahlah, Tirzah, and Hoglah, and Milcah, and Noah, the daughters of Zelophehad, were married unto their father's brothers' sons.
Incestuous relationships are considered so severe among chillulim HaShem as to be, along with the other forbidden relationships that are mentioned in Leviticus 18, punishable by death as specified in Leviticus 20.
In the 4th century BCE, the Soferim (scribes) declared that there were relationships within which marriage constituted incest, in addition to those mentioned by the Torah. These additional relationships were termed seconds (Hebrew: sheniyyot), and included the wives of a man's grandfather and grandson. The classical rabbis prohibited marriage between a man and any of these seconds of his, on the basis that doing so would act as a safeguard against infringing the biblical incest rules, although there was inconclusive debate about exactly what the limits should be for the definition of seconds.
Marriages that are forbidden in the Torah (with the exception of uncle-niece marriages) were regarded by the rabbis of the Middle Ages as invalid – as if they had never occurred; any children born to such a couple were regarded as bastards under Jewish law, and the relatives of the spouse were not regarded as forbidden relations for a further marriage. On the other hand, those relationships which were prohibited due to qualifying as seconds, and so forth, were regarded as wicked, but still valid; while they might have pressured such a couple to divorce, any children of the union were still seen as legitimate.
The Catholic Church does not generally permit the marriage if a doubt exists on whether the potential spouses are related by blood relations in any degree of the direct line or in the second degree of the collateral line.
Definitions of incest varied throughout history. The Fourth Lateran Council held in 1215 attempted to codify that marriage was forbidden up to and including third cousins, though permissible beyond this for fourth cousins, third cousins once removed, etc.
In the Eastern Orthodox Church, marriages are banned between second cousins or closer and between second uncles / aunts and second nieces / nephews (between first cousins once removed) or closer. Marrying one's godparent or deceased spouse's sibling is also prohibited, although marrying one's stepchild is not – e.g. Vyacheslav Ivanov exercised his right to marry his stepdaughter after her mother's (his first wife's) death.
The Quran gives specific rules regarding incest, which prohibit a man from marrying or having sexual relationships with:
Cousin marriage finds support in Islamic scriptures and is widespread in the Middle East.
According to Professor Steve Jones it is common in the Islamic world for men to marry their nieces and cousins. He said "It is common in the Islamic world to marry your brother’s daughter, which is actually closer than marrying your cousin."[undue weight? ]
In Zoroastrianism, incest between cousins is a virtue although in some sources incest is believed to be related to that of parent-child or brothers-sisters. This is called Xvaetvadatha. Friedrich Nietzsche, in his book The Birth of Tragedy, cites that among Zoroastrians a wise priest is born only by Xvaetvadatha To what extent Xvaetvadatha was practiced in Sasanian Iran and before, especially outside the royal and noble families (“dynastic incest”) and, perhaps, the clergy, and whether practices ascribed to them can be assumed to be characteristic of the general population is not clear. Evidence from Dura-Europos, however, combined with that of the Jewish and Christian sources citing actual cases under the Sasanians, strengthen the evidence of the Zoroastrian texts. In the post-Sasanian Zoroastrian literature, Xvaetvadatha is said to refer to marriages between cousins which have always been relatively common.[excessive citations] When Anquetil Duperron visited the Parsis in the mid-18th century, he was told the term referred to marriage with cousins, and according to James Darmesteter, it was rare for a Parsi to marry out of the family; marriage between cousins (a marriage made in heaven) was both practical and normal, while incestuous marriage was taboo and illegal.
Rigveda regard incest to be "evil". Hinduism speaks of incest in abhorrent terms. Hindus believes there are both karmic and scientifically bad effects of incest and thus practice strict rules of both endogamy and exogamy, as well as same family tree (gotra) or bloodline (Pravara). Marriage within the gotra ("swagotra" marriages) are banned under the rule of exogamy in the traditional matrimonial system. People within the gotra are regarded as kin and marrying such a person would be thought of as incest. i.e. Marriage with paternal cousins is strictly prohibited. Marriage between two people whose parents are related paternally up to several generations is expressly prohibited. Gotra is transferred down the male lineage while the Gotra of a female changes upon marriage. i.e., upon marriage a woman would belong to her husband's lineage.
- "Incest". Oxford University Press. 2013. Retrieved August 27, 2013.
- "Incest". Rape, Abuse & Incest National Network (RAINN). 2009. Retrieved August 27, 2013.
- Bittles, Alan Holland (2012). Consanguinity in Context. Cambridge University Press. pp. 178–187. ISBN 0521781868. Retrieved August 27, 2013.
- Hipp, Dietmar (2008-03-11). "German High Court Takes a Look at Incest". Der Spiegel. Retrieved 2008-04-12.
- Wolf, Arthur P.; Durham, William H. (2004). Inbreeding, Incest, and the Incest Taboo: The State of Knowledge at the Turn of the Century. Stanford University Press. p. 169. ISBN 0-8047-5141-2.
- Encyclopedia of Love in World Religions - Volume 1 - Page 321, Yudit Kornberg Greenberg - 2008
- Language and Social Relations - Page 379, Asif Agha - 2007.
- The Encyclopedia of Genetic Disorders and Birth Defects - Page 101, James Wynbrandt, Mark D. Ludman - 2009.
- Wolf, Arthur P.; Durham, William H. (2004). Inbreeding, Incest, and the Incest Taboo: The State of Knowledge at the Turn of the Century. Stanford University Press. p. 3. ISBN 0-8047-5141-2.
- Fareed, M; Afzal, M (2014). "Estimating the inbreeding depression on cognitive behavior: A population based study of child cohort". PLoS ONE. 9 (10): e109585. PMC . PMID 25313490. doi:10.1371/journal.pone.0109585.
- Maurice Godelier, Métamorphoses de la parenté, 2004
- "New Left Review - Jack Goody: The Labyrinth of Kinship". Retrieved 2007-07-24.
- Bateson, Gregory (2000). Steps to an Ecology of Mind: Collected Essays in Anthropology, Psychiatry, Evolution, and Epistemology. University Of Chicago Press. ISBN 978-0-226-03905-3.
- Briggs, Jean (2006). Never in Anger: Portrait of an Eskimo Family. Harvard University Press. ISBN 978-0-674-60828-3.
- The Tapestry of Culture: An Introduction to Cultural Anthropology, Ninth Ed., Abraham Rosman, Paula G. Rubel, Maxine Weisgrau, 2009, AltaMira Press, p. 101
- OED Ancrene Riwle (c. 1225) has Incest‥is bituȝe sibbe fleschliche, where either the generic or the narrow sense may be intended. See also inetymonline.comest
- Oxford Concise Dictionary of Etymology, T. F. Hoad (ed.) (1996), p. 232
- Wollert, R (2001). An analysis of the argument that clinicians under-predict sexual violence in civil commitment cases. pp. 171–184.
His first criterion was that follow-up research on rapists and extrafamilial molesters should be studied while research on incesters and intrafamilial molesters should be screened out.
- Crowley, Sue (2002). Exploring the multiplicity of childhood sexual abuse with a focus on polyincestuous contexts of abuse. Taylor & Francis. pp. 91–110.
They also suggested that researchers have created “a false dichotomy” (p. 33) by studying extrafamilial child molesters (eg, those who abuse other families' children) as though they were distinct from intrafamilial child incesters (eg, those who molest children within their own family)
- Caputi, Jane (2009). "Hyapatia". Unthinkable fathering: connecting incest and nuclearism. Wiley Online Library. pp. 102–122.
- L Conyers, James (2002). Black Cultures and Race Relations. Rowman & Littlefield. p. 115. ISBN 9780830415748.
- University of California (1945). American Journal of Psychiatry (Volume 101 ed.). p. 425.
Psychoanalytic interpretations of some of the elements of incestuous reactions and a classification of incestuals are proposed.
- Charlesworth, Deborah (2009). Introduction to Plant Population Biology. John Wiley & Sons. p. 80.
- Gulik, Robert Hans van (1974). Sexual Life in Ancient China: a Preliminary Survey of Chinese Sex and Society from ca. 1500 B.C. till 1644 A.D. Leiden: Brill. p. 19. ISBN 90-04-03917-1.
- Lewis, N. (1983). Life in Egypt under Roman Rule. Clarendon Press. ISBN 0-19-814848-8.
- Frier, Bruce W.; Bagnall, Roger S. (1994). The Demography of Roman Egypt. Cambridge, UK: Cambridge University Press. ISBN 0-521-46123-5.
- Shaw, B. D. (1992). "Explaining Incest: Brother-Sister Marriage in Graeco-Roman Egypt". Man, New Series. 27 (2): 267–299. JSTOR 2804054. doi:10.2307/2804054.
- Hopkins, Keith (1980). "Brother-Sister Marriage in Roman Egypt" (PDF). Comparative Studies in Society and History. 22 (3): 303–354. doi:10.1017/S0010417500009385.
- Lahanas, Michael (2006). "Elpinice". Hellenic World encyclopaedia. Hellenica. Archived from the original on 2009-09-21. Retrieved 2009-06-06.
- Vergil Aeneid Book VI in Latin: The descent to the Underworld. Ancienthistory.about.com (2010-06-15). Retrieved on 2011-10-01.
- Patrick Colquhoun, A Summary of the Roman Civil Law, Illustrated by Commentaries on and Parallels from the Mosaic, Canon, Mohammedan, English, and Foreign Law (London: Wm. Benning & Co., 1849), p. 513-4
- Potter, 2007, p. 62.
- Potter, 2007, p. 66.
- Grubbs, Judith Evans (2002). Women and the Law in the Roman Empire: a Sourcebook on Marriage, Divorce and Widowhood. Psychology Press. pp. 137–. ISBN 978-0-415-15240-2. Retrieved 7 November 2011.
- Cain and Abel in Text and Tradition: Jewish and Christian Interpretations of the First Sibling Rivalry, John Byron - 2011, page 27
- The Empowerment of Women in the Book of Jubilees - Page 17, Betsy Halpern Amaru - 1999
- Smith, George Patrick (1998). Family Values and the New Society: Dilemmas of the 21st Century. Greenwood Publishing Group via Google Books. p. 143.
- "The Risks and Rewards of Royal Incest". National Geographic Magazine.
- Sarmiento de Gamboa, Pedro. The History of the Incas. Austin: University of Texas Press, 2007. p.171. ISBN 978-0-292-71485-4.
- Lloyd, Arthur (2004). The Creed Of Half Japan: Historical Sketches Of Japanese Buddhism. Kessinger Publishing via Google Books. p. 180.
- Cranston, Edwin A. (1998). A Waka Anthology: The Gem-Glistening Cup. Stanford University Press via Google Books. p. 805.
- Shultz, Edward J. (2000). Generals and Scholars: Military Rule in Medieval Korea. University of Hawaii Press, p. 169.
- Wiehe, Vernon R. (1996). The Brother/Sister Hurt: Recognising the Effects of Sibling Abuse. Safer Society Press.
- Wal, Ruchi Mishra S. (2000). Ency. Of Health Nutrition And Family Wel.(3 Vol). Sarup & Sons. p. 166. ISBN 978-81-7625-171-6.
- United Nations Publications (2002). Asia-Pacific Population Journal. United Nations Publications. p. 23. ISBN 978-92-1-120340-0.
- Faller, Kathleen C. (1993). Child Sexual Abuse: Intervention and Treatment Issues. DIANE Publishing. p. 64. ISBN 978-0-7881-1669-8.
- Schetky, Diane H.; Green, Arthur H. (1988). Child Sexual Abuse: A Handbook for Health Care and Legal Professionals. Psychology Press. p. 128. ISBN 978-0-87630-495-2.
- Courtois, Christine A. (1988). Healing the Incest Wound: Adult Survivors in Therapy. W. W. Norton & Company. p. 208. ISBN 0-393-31356-5.
- Nemeroff, Charles B.; Craighead, W. Edward (2001). The Corsini Encyclopedia of Psychology and Behavioral Science. New York: Wiley. ISBN 0-471-24096-6.
- Aeneid by Virgil, Book VI: "hic thalamum invasit natae vetitosque hymenaeos;" = "this [man being punished in Hades] invaded a daughter's private room and a forbidden marital relationship."
- Herman, Judith (1981). Father-Daughter Incest. Cambridge, Massachusetts: Harvard University Press. p. 282. ISBN 0-674-29506-4.
- Goldman, R.; Goldman, J. (1988). "The prevalence and nature of child sexual abuse in Australia". Australian Journal of Sex, Marriage and Family. 9 (2): 94–106.
- Wiehe, Vernon (1997). Sibling Abuse: Hidden Physical, Emotional, and Sexual Trauma. Sage Publications, ISBN 0-7619-1009-3
- Rayment-McHugh, Sue; Ian Nesbit (2003). "Sibling Incest Offenders As A Subset of Adolescent Sex Offenders." Paper presented at the Child Sexual Abuse: Justice Response or Alternative Resolution Conference convened by the Australian Institute of Criminology and held in Adelaide, 1–2 May 2003
- Canavan, M. C.; Meyer, W. J.; Higgs, D. C. (1992). "The female experience of sibling incest". Journal of Marital and Family Therapy. 18 (2): 129–142. doi:10.1111/j.1752-0606.1992.tb00924.x.
- Smith, H.; Israel, E. (1987). "Sibling incest: A study of the dynamics of 25 cases". Child Abuse and Neglect. 11 (1): 101–108. PMID 3828862. doi:10.1016/0145-2134(87)90038-X.
- Cole, E (1982). "Sibling incest: The myth of benign sibling incest". Women and Therapy. 1 (3): 79–89. doi:10.1300/J015V01N03_10.
- Cawson, P., Wattam, C., Brooker, S., & Kelly, G. (2000). Child maltreatment in the United Kingdom: A study of the prevalence of child abuse and neglect. London: National Society for the Prevention of Cruelty to Children. ISBN 1-84228-006-6
- Sibling incest is roughly five times as common as other forms of incest according to Gebhard, P., Gagnon, J., Pomeroy, W., & Christenson, C. (1965). Sex Offenders: An Analysis of Types. New York: Harper & Row.
- Finkelhor, David (1981). Sexually Victimized Children. Simon and Schuster. ISBN 0-02-910400-9.
- A large-scale study of (n = 3,000) by the UK's National Council for the Prevention of Cruelty to Children found that fathers committed about 1% of child sex abuse, while siblings committed 14%. See BBC News Online: Health, Child Abuse Myths Shattered, November, 20, 2000
- O'Brien, M. J. (1991). "Taking sibling incest seriously." In M. Patton (ed.), Family Sexual Abuse: Frontline Research and Evaluation, pp. 75–92. Newbury Park, CA: Sage Publications.
- Laviola, M. (1992). "Effects of older brother-younger sister incest: A study of the dynamics of 17 cases". Child Abuse and Neglect. 16 (3): 409–421. PMID 1617475. doi:10.1016/0145-2134(92)90050-2.
- Cyr, M.; Wright, J.; McDuff, P.; Perron, A. (2002). "Intrafamilial sexual abuse: Brother-sister incest does not differ from father-daughter and stepfather-stepdaughter incest". Child Abuse and Neglect. 26 (9): 957–973. PMID 12433139. doi:10.1016/S0145-2134(02)00365-4.
- Fridell, Lorie A. (October 1990). "Decision-making of the District Attorney: diverting or prosecuting intrafamilial child sexual abuse offenders". Criminal Justice Policy Review. Sage. 4 (3): 249–267. doi:10.1177/088740349000400304.
- Turner, Jeffrey S. (1996). Encyclopedia of Relationships Across the Lifespan. Greenwood Publishing Group. p. 92. ISBN 0-313-29576-X.
- Kinnear, Karen L. Childhood Sexual Abuse: A Reference Handbook. p. 8.
- Dorais, Michel (2002). Don't Tell: The Sexual Abuse of Boys. Translated by Isabel Denholm Meyer. McGill-Queen's Press. p. 24. ISBN 0-7735-2261-1.
- Courtois, Christine A. (1988). Healing the Incest Wound: Adult Survivors in Therapy. W. W. Norton & Company. ISBN 0-393-31356-5.
- "India's hidden incest ," BBC News, January 22, 1999.
- "Incest". National Center for Victims of Crime and Crime Victims Research and Treatment Center. National Center for Victims of Crime. 1992.
- Emotional Inheritance: A Dubious Legacy. (May 21, 1977). Science News, 111 (21), 326.
- Trepper, Terry S.; Barrett, Mary Jo (1989). Systemic Treatment of Incest: A Therapeutic Handbook. Psychology Press. ISBN 0-87630-560-5.
- Kluft, Richard P. (1990). Incest-Related Syndromes of Adult Psychopathology. American Psychiatric Pub, Inc. pp. 83, 89. ISBN 0-88048-160-9.
- Margolin, Leslie (1985). "The effects of mother-son incest". Journal of Family and Economic Issues. 8 (2): 104–114. doi:10.1007/BF01553341.
- Cruise, David, and Griffiths, Alison. On South Mountain: The Dark Secrets of the Goler Clan (Penguin Books, 1998) ISBN 0-670-87388-8
- "DFaCS (NSW) and the Colt Children  NSWChC 5". Children's Court, New South Wales. 13 September 2013. Archived from the original on 17 December 2013.
- Sutton, Candace (December 10, 2013). "The case of incest and depravity which came to rest in the hills of a quiet country town". News Corp Australia.
- Sutton, Candace (December 12, 2013). "The family tree of the depraved family who live in the hills of a quiet country town". News Corp Australia.
- Tokuoka, Hideo and Cohen, Albert K. (1987). "Japanese Society and Delinquency". International Journal of Comparative and Applied Criminal Justice. 11 (1–2): 13–22. doi:10.1080/01924036.1987.9688852. Retrieved 28 June 2012.
- Gough, David (February 1996). "Child Abuse in Japan". Child and Adolescent Mental Health. 1 (1): 12–18. doi:10.1111/j.1475-3588.1996.tb00003.x. Retrieved 28 June 2012.
- Kalogerakis, Michael G.; American Psychiatric Association. Workgroup on Psychiatric Practice in the Juvenile Court (1992). Handbook of psychiatric practice in the juvenile court: the Workgroup on Psychiatric Practice in the Juvenile Court of the American Psychiatric Association. American Psychiatric Pub. p. 106. ISBN 978-0-89042-233-5.
- Carlson, Bonnie E.; MacIol, K; Schneider, J (2006). "Sibling Incest: Reports from Forty-One Survivors". Journal of Child Sexual Abuse. 15 (4): 19–34. PMID 17200052. doi:10.1300/J070v15n04_02.
- Leder, Jane Mersky. "Adult Sibling Rivalry: Sibling rivalry often lingers through adulthood". Psychology Today. January/February 93. Sussex Publishers. Archived from the original on 2008-12-28.
- Rudd, Jane M.; Herzberger, Sharon D. (September 1999). "Brother-sister incest—father-daughter incest: a comparison of characteristics and consequences". Child Abuse & Neglect. 23 (9): 915–928. doi:10.1016/S0145-2134(99)00058-7.
- Cyr, Mireille; Wrighta, S John; McDuffa, Pierre; Perron, Alain (September 2002). "Intrafamilial sexual abuse: brother–sister incest does not differ from father–daughter and stepfather–stepdaughter incest". Child Abuse & Neglect. 26 (9): 957–973. PMID 12433139. doi:10.1016/S0145-2134(02)00365-4.
- Hari, Johann (2002-01-09). "Forbidden love". The Guardian. Retrieved 2008-04-11.
- Roffee, James (2015). "When Yes Actually Means Yes". Rape Justice: 72–91. doi:10.1057/9781137476159.0009. Archived from the original on 2017-02-02.
- "Dr James Roffee". Monash university.
- "Roffee, J. A. (2014). No Consensus on Incest? Criminalisation and Compatibility with the European Convention on Human Rights". doi:10.1093/hrlr/ngu023].
- Roffee, J.A. (2014). "Synthetic Necessary Truth Behind New Labour's Criminalisation of Incest". Social & Legal Studies. 23: 113–130. doi:10.1177/0964663913502068.
- Saletan, William (2003-04-23). "Incest Repellent? If gay sex is private, why isn't incest?". Slate Magazine. Retrieved 2008-04-12.
- Volokh, Eugene (December 12, 2010). "Incest". The Volokh Conspiracy.
- Saletan, William (Dec 14, 2010). "Incest Is Cancer". Slate. Retrieved 30 April 2012.
- Netherlands: CDA Think-Tank Wants Drastic Measures Against ‘Imported Brides’
- "is incest strafbaar ? | Goede raad is goud waard - Advocatenkantoor Elfri De Neve" (in Dutch). Elfri.be. 2009-07-15. Retrieved 2013-07-30.
- Criminal Law - Page 200, John M. Scheb - 2008
- Family Law in the USA - Page 207, Lynn Dennis Wardle, Laurence C. Nolan - 2011
- The Encyclopedia of Genetic Disorders and Birth Defects - Page 101, James Wynbrandt, Mark D. Ludman - 2010
- "Incest by a man.". Sexual Offences Act 1956. National Archives UK. Retrieved 28 March 2014.
- "Sexual Offences Act 2003". legislation.gov.uk. The National Archives of United Kingdom. Retrieved 28 March 2014.
- CNN: German incest couple lose European court case
- Judgment on the Stübing vs. Germany case. European Court of Human Rights.
- "German Ethics Council: Incest Is a Right". The Daily Beast. 2014-09-24. Retrieved 2014-10-05.
- "Incest a 'fundamental right', German committee says". The Telegraph. 2014-09-24. Retrieved 2014-10-05.
- The Demography of Roman Egypt, Roger S. Bagnall, Bruce W. Frier - 2006 p.128
- Sexual Knowledge, Sexual Science: The History of Attitudes to Sexuality, Roy Porter, Mikuláš Teich - 1994 p.239
- Joanna Grossman, Should the law be kinder to kissin' cousins?
- Boseley, Sarah (4 July 2013). "Marriage between first cousins doubles risk of birth defects, say researchers". theguardian.com. The Guardian. Retrieved 28 March 2014.
- Saggar, A; Bittles, A (2008). "Consanguinity and child health" (PDF). Paediatrics and Child Health. 18 (5): 244–249. doi:10.1016/j.paed.2008.02.008.
- Joseph, Suad; Najmabadi, Afsaneh (2003). Encyclopedia of Women & Islamic Cultures: Family, Body, Sexuality and Health. Brill. p. 261. ISBN 978-90-04-12819-4.
- Towie, Narelle (2008-05-31). "Most babies born to first-cousins are healthy". Perth Now. Retrieved 2012-01-05.
- Pollak, Ellen (2003). Incest and the English Novel, 1684–1814. Baltimore MD: Johns Hopkins University Press. p. 38. ISBN 0-8018-7204-9.
- Tann, Jennifer (May 2007). "Boulton, Matthew (1728–1809)". Oxford Dictionary of National Biography. Oxford, England: Oxford University Press.
- Livingstone, F. B. (1969). "Genetics, Ecology, and the Origins of Incest and Exogamy". Current Anthropology. 10: 45–62. doi:10.1086/201009.
- Thornhill, Nancy Wilmsen (1993). The Natural History of Inbreeding and Outbreeding: Theoretical and Empirical Perspectives. Chicago: University of Chicago Press. ISBN 0-226-79854-2.
- Antfolk, Jan; Lieberman, Debra; Santtila, Pekka. "Fitness Costs Predict Inbreeding Aversion Irrespective of Self-Involvement: Support for Hypotheses Derived from Evolutionary Theory". PLoS ONE. 7 (11): e50613. PMC . PMID 23209792. doi:10.1371/journal.pone.0050613.
- Lieberman, D.; Tooby, J.; Cosmides, L. (2003). "Does morality have a biological basis? An empirical test of the factors governing moral sentiments relating to incest". Proceedings of the Royal Society B: Biological Sciences. 270 (1517): 819–826. PMC . PMID 12737660. doi:10.1098/rspb.2002.2290.
- Bittles, A.H. (2001). "A Background Summary of Consaguineous marriage" (PDF). consang.net. Retrieved 2010-01-19., citing Bittles, A. H.; Neel, J.V. (1994). "The costs of human inbreeding and their implications for variation at the DNA level". Nature Genetics. 8 (2): 117–121. PMID 7842008. doi:10.1038/ng1094-117.
- Baird, P. A.; McGillivray, B. (1982). "Children of incest". The Journal of Pediatrics. 101 (5): 854–7. PMID 7131177. doi:10.1016/S0022-3476(82)80347-8.
- Wolf, Arthur P.; William H. Durham (2004). Inbreeding, Incest, and the Incest Taboo: The State of Knowledge at the Turn of the Century. Stanford University Press. p. 169. ISBN 0-8047-5141-2.
- Incest not so taboo in nature Livescience, retrieved 29 January 2012
- Sexual Behaviour In Animals A. Sarkar; retrieved 29 January 2012
- Incest: an age-old taboo. BBC. 12 March 2007. retrieved 22 January 2011
- See Articles 218-221 of the Romanian Penal Code 
- Also see the Central Conference of American Rabbis' Responsum 142.
- Yebamot' (Tosefta) 2:3
- Yebamot 21a
- This article incorporates text from a publication now in the public domain: Singer, Isidore; et al., eds. (1901–1906). "incest". Jewish Encyclopedia. New York: Funk & Wagnalls Company.
- Shulchan 'Aruk, Eben ha-'Ezer, 16, 1
- Yebamot 94b
- Code of Canon Law. Can. 1091
- "A Table of Kindred and Affinity". Book of Common Prayer. Canada. 1962.
- "Sûrah an Nisa 4:22".
- "Sûrah an Nisa 4:23".
- "Surah an-Nisa 4:23".
- Inhorn, Marcia C.; Chavkin, Wendy; Navarro, José-Alberto (2014). Globalized Fatherhood. New York City: Berghahn Books. p. 245. ISBN 9781782384380.
- Shaykh Faraz A. Khan (7 October 2011). "Did the Prophet (Peace Be Upon Him) Discourage Marrying Cousins? - SeekersHub Answers". SeekersHub Answers. Retrieved 12 August 2017.
- Abdullah Ghadai (10 May 2015). "Marriage between cousins - IslamQA". IslamQA. Checked and Approved by, Mufti Ebrahim Desai. Retrieved 12 August 2017. line feed character in
|others=at position 25 (help)
- Saleem Ahmed, Ph.D. "Cousin Marriage Among Muslims". Muslim Council of America Foundation. Retrieved 12 August 2017.
- Jonathan Wynne-Jones - Hay Festival 2011: Professor risks political storm over Muslim 'inbreeding’ - The Telegraph, May 29, 2011. (Archived)
- Sex and Punishment Four Thousand Years of Judging Desire, Eric Berkowitz. pp. 21–22, 2012.
- The Birth of Tragedy, Friedrich Nietzsche. Anaconda Verlag - 2012.
- Michael Mitterauer, “The Customs of the Magians: The Problem of Incest in Historical Societies,” in Roy Porter and Mikuláš Teich, eds., Sexual Knowledge, Sexual Science: The History of Attitudes to Sexuality, Cambridge, UK, and New York, 1994, pp. 231-50.
- Jakob Eduard Polak, Persien, das Land und seine Bewohner: ethnographische Schilderungen, 2 vols in one, Leipzig, 1865; tr. Kaykāvus Jahāndāri as Safar-nāma-ye Polāk: Iran wa Irāniān, Tehran, 1982.
- James Darmesteter, Ormazd et Ahriman, leurs origines et leur histoire, Bibliothèque de l’Ecole des hautes études ... Sciences philologiques et historiques 29, Paris, 1877.
- Benjamin P. Givens and Charles Hirschman, "Modernization and Consanguineous Marriage in Iran," Journal of Marriage and the Family 56, 1994, pp. 820-34.
- Clarisse Herrenschmidt, "Le xwêtôdas ou mariage «incestueux» en Iran ancien," in Pierre Bonte, ed., Epouser au plus proche, inceste, prohibitions et stratégies matrimoniales autour de la Méditerranée, Paris, 1994, pp. 113-25.
- Alan H. Bittles et al., “Human Inbreading: A Familiar Story Full of Surprises,” in Helen Macbeth and Prakash Shetty, eds., Health and Ethnicity, Society for the Study of Human Biology Series 41, London, 2001, pp. 68–78.
- O'Flaherty, Wendy Doniger. The Origins of Evil in Hindu Mythology. University of California Press. p. 7.
- "there can be no matrimony between the sects of Gehlawat and Kadiyan as they have a "brotherhood" akin to consanguinity."Haryana panchayat takes on govt over same-gotra marriage. Indian Express. July 20, 2009
- depending on culture and caste of the population in the region marriage may be restricted up to 7 generations of gotra of father, mother and grandmother, while sometimes in few rural areas marriage is banned within same community or even village and is only allowed with those from outside of the village as they consider a small village to be brothers and sister of one large family. These rules are strictly enforced and a couple breaking them is violently punished sometimes."In India these rules are reproduced in the form of that one must not marry within the Gotra, but not without the caste" Limitations of Marriage Archived 2010-11-03 at the Wayback Machine.. sanathanadharma.com
- page 526, The Illustrated Encyclopedia of Hinduism: N-Z, By James G. Lochtefeld, Rosen Publishing Group, 2002
- Bixler, Ray H. (1982) "Comment on the Incidence and Purpose of Royal Sibling Incest," American Ethnologist, 9(3), August, pp. 580–582.
- Leavitt, G. C. (1990) "Sociobiological explanations of incest avoidance: A critical claim of evidential claims", American Anthropologist, 92: 971–993.
- Potter, David Morris (2007). Emperors of Rome. Englewood Cliffs, N.J: Quercus. ISBN 1-84724-166-2.
- Sacco, Lynn (2009). Unspeakable: Father–Daughter Incest in American History. Johns Hopkins University Press. 351 ISBN 978-0-8018-9300-1
- "Incest". Encyclopædia Britannica. 14 (11th ed.). 1911.
- Incest at DMOZ
- "Incest / Sexual Abuse of Children" by Patricia D. McClendon, MSSW