Avoidance and prohibition of brother–sister sex in humans

  title={Avoidance and prohibition of brother–sister sex in humans},
  author={Kenichi Aoki},
  journal={Population Ecology},
Sex between full sibs is unusual in birds, mammals, and humans. These species likely possess an innate avoidance mechanism based on early proximity (i.e., the Westermarck hypothesis), and the “rare” occurrences may be attributable to error. Alternatively, an inclusive fitness argument shows that a low rate of sib mating may be an “adaptation.” The widespread occurrence of a prohibition against brother–sister sex in human societies is often invoked as evidence against an innate avoidance… CONTINUE READING