Taboo brother sister sex

The cultural evolution of morality is not tightly constrained by our biological endowment in the way some philosophers and evolutionary psychologists believe. There is a widespread prohibition on brother—sister marriage across human cultures, reflecting a widespread taboo on brother—sister sex Wolf and Durham Some scholars believe the sibling incest taboo has a clear biological basis, and they see it as a paradigm case of biology influencing or determining a social norm. Following Westermarck , they argue that, in order to avoid close inbreeding, we evolved to feel sexual aversion toward people with whom we are raised as young children—people who are almost always our biological siblings. Lowered genetic fitness due to inbreeding led to the evolution of the juvenile sensitive period [to develop sexual aversion] by means of natural selection; the inhibition experienced at sexual maturity led to prohibitions and cautionary myths against incest or in many societies merely a shared feeling that the practice is inappropriate.

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