1. Phil Karn Phil Karn United States says:

    Incest is so taboo not because of human reason but instinct. It's called the Westermarck Effect. Being around a young child immunizes you to sexual attraction to that person when they mature. The same thing seems to happen in many animal species; e.g., orcas stay with their families their entire lives, with the males helping protect the young, but they'll always venture off to other pods to mate.

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