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Koju Takeda

on September 06, 2021

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Twins and Eroticism: When Similarity Turns into Fantasy

The Westermarck Effect and the Psychological Tension of Twin Fetish One of the most discussed concepts in evolutionary psychology regarding incest and attraction is the so-called Westermarck Effect. Proposed by Finnish anthropologist Edvard Westermarck at the end of the 19th century, it suggests that people who grow up together from early childhood develop a psychological mechanism of mutual sexual inhibition. In other words, when individuals share very close proximity during their formative years, the brain “learns” not to perceive that person as a potential sexual partner. This mechanism is believed to have evolved as a way of avoiding biological incest, thereby reducing genetic risks and strengthening reproductive diversity. Later studies reinforce the hypothesis: in communities where non-related children were raised together, such as in Israeli kibbutzim, almost no couples were formed among them in adulthood (Shepher, 1971). But what does this have to do with the fetish for t...

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Koju Takeda

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