incest
Sexual intercourse between persons thought to be too closely related to marry; the exact relationships that fall under the incest taboo vary widely from society to society. A biological explanation for the incest taboo is based on the necessity to avoid inbreeding.
Within groups in which ritual homosexuality is practised, for example in New Guinea, an incest taboo applies also to these relations, suggesting that the taboo is as much social as biological in origin.
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