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Incest : ウィキペディア英語版
Incest

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, such as individuals of the same household, step relatives, 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, step-siblings, and adoptive siblings.〔Encyclopedia of Love in World Religions - Volume 1 - Page 321, Yudit Kornberg Greenberg - 2008〕〔Language and Social Relations - Page 379, Asif Agha - 2007.〕 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 Encyclopedia of Genetic Disorders and Birth Defects - Page 101, James Wynbrandt, Mark D. Ludman - 2009.〕 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 given for the incest taboo is the impact inbreeding may have on children of incestuous sex. Children whose biological parents have a close genetic relationship have an increased risk of congenital disorders, death, and disability due at least in part to genetic diseases caused by the inbreeding. Unintended sexual relations between genetically related persons may also arise when either or both biological parents are unknown or uncertain, as in the case of children born as a result of casual or extramarital sexual relations, anonymous sperm donation, surrogacy, or adoption. On the other hand, most prohibitions on incest extend the categories of prohibited relationships to affinity relationships such as in-law relations, step relations, and relations through adoption, among others. As such, the incest taboo is not solely based on inbreeding, and also applies to sexual activity between relatives (genetically related or otherwise) who cannot have children or to sexual activity between relatives where conception is not likely to occur (for example, because of the use of contraception).
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.〔Maurice Godelier, Métamorphoses de la parenté, 2004〕〔(【引用サイトリンク】title=New Left Review - Jack Goody: The Labyrinth of Kinship )〕 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 Tapestry of Culture: An Introduction to Cultural Anthropology'', Ninth Ed., Abraham Rosman, Paula G. Rubel, Maxine Weisgrau, 2009, AltaMira Press, p. 101〕
==Terminology==
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〔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 )〕) and in the narrow modern sense.
The derived adjective ''incestuous'' appears in the 16th century.〔''Oxford Concise Dictionary of Etymology'', T. F. Hoad (ed.) (1996), p. 232〕
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.

抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)
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