Westermarck effect
Hypothesis that those who grow up together become desensitized to sexual attraction / From Wikipedia, the free encyclopedia
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The Westermarck effect, also known as reverse sexual imprinting, is a psychological hypothesis that states that people tend not to be attracted to peers with whom they lived like siblings before the age of six. This hypothesis was first proposed by Finnish anthropologist Edvard Westermarck in his book The History of Human Marriage (1891) as one explanation for the incest taboo.[1]