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Incest taboo : ウィキペディア英語版
Incest taboo

An incest taboo is any cultural rule or norm that prohibits sexual relations between closely related persons. All human cultures have norms that exclude certain close relatives from those considered suitable or permissible sexual or marriage partners, making such relationships taboo. However, different norms exist among cultures as to which blood relations are permissible as sexual partners and which are not. The sexual relations between related persons which are subject to the taboo are called incestuous relationships.
Some cultures proscribed sexual relations between clan-members, even when no traceable biological relationship exists, while members of other clans are permissible irrespective of the existence of a biological relationship. In many cultures, certain types of cousin relations are preferred as sexual and marital partners, whereas in others these are taboo. Some cultures permit sexual and marital relations between aunts/uncles and nephews/nieces. In some instances, brother–sister marriages have been practiced by the elites with some regularity. Parent–child and sibling–sibling unions are almost universally taboo.〔''The Tapestry of Culture An Introduction to Cultural Anthropology'', Ninth Edition, Abraham Rosman, Paula G. Rubel, Maxine Weisgrau, 2009, AltaMira Press. ISBN 9780759111394. p.101〕
==Source of the taboo==
Debate about the origin of the incest taboo has often been framed as a question of whether it is based in nature or nurture.
One explanation sees the incest taboo as a cultural implementation of a biologically evolved preference for sexual partners with whom one is unlikely to share genes, since inbreeding may have detrimental outcomes. The most widely held hypothesis proposes that the so-called Westermarck effect discourages adults from engaging in sexual relations with individuals with whom they grew up. The existence of the Westermarck effect has achieved some empirical support.〔''Inbreeding, Incest, and the Incest Taboo: The State of Knowledge at the Turn of the Century'', Arthur P. Wolf and William H. Durham (Editors), Stanford University Press, 2004, ISBN 978-0804751414. Introduction〕
Another school argues that the incest prohibition is a cultural construct which arises as a side effect of a general human preference for group exogamy, which arises because intermarriage between groups construct valuable alliances that improve the ability for both groups to thrive. According to this view, the incest taboo is not necessarily universal, but is likely to arise and become more strict under cultural circumstances that favour exogamy over endogamy, and likely to become more lax under circumstances that favor endogamy. This hypothesis has also achieved some empirical support.

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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