Among the Hawaiians, incestuous marriage within the aristocracy was the norm. And in Melanesia, father-daughter incest was tolerated.
However, sexual relations between a girl and her maternal uncle were taboo. And in the Trobiand Islands, incest between siblings was prohibited to such a degree that, should a boy witness his sister having sexual relations, both of them, as well as her lover, were required to commit ritual suicide by jumping from a palm tree.
