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The Brain Has 3 Systems for Mating — Combined, They Promote Adultery
Even though adultery is punishable by death in some societies, it still occurs regularly. This tells Dr. Helen Fisher there is probably a genetic predisposition toward cheating on your partner. Of course not everyone cheats, so it's not necessary for survival, but if we dial back ten thousand years, to a time when resources were more scarce, adultery would have helped genes survive the present generation and be passed onto the next. That gives a clear rational for men's desire to cheat, but what about women? Fisher offers several explanations...