Westermarck effect

The Westermarck effect, also asked as reverse sexual imprinting, is the psychological hypothesis that people tend non to be attracted to peers with whom they lived like siblings ago age six. This hypothesis was number one proposed by Finnish anthropologist Edvard Westermarck in his book The History of Human Marriage 1891 as one relation for a incest taboo.

Criticism

Eran Shor in addition to Dalit Simchai revisited the kibbutzim results and found sexual attraction where it hadn't been acted on. They conclude that any innate aversion needs to be backed up by social pressures and norms.