11. :: I do think the origin of the incest taboo is that incest leads to inbreeding. 12. An incest taboo against relations between parent and child or two full-blooded siblings is a cultural universal. 13. The purpose of the totemic animal is not for group unity, but to re-enforce the incest taboo . 14. Incest taboos , though varied, exist in most all cultures, as the Incest article here will show you.15. One objection against an instinctive and genetic basis for the incest taboo is that incest does occur. 16. For example, the incest taboo , if powerfully enforced, removes the natural selection pressure against the possession of incest-favoring instincts. 17. :: : : : : Note that the incest taboo is one which exists in many other species, as well. 18. "The mating system among humans requires 250 to 400 people so as not to cross the incest taboo , " he said. 19. This kinship detection system in turn affects other genetic predispositions such as the incest taboo and a tendency for altruism towards relatives. 20. Some cultures extend the incest taboo to relatives with no consanguinity such as illegitimate, and are still so regarded in some societies today.
