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Gossiping for Mates | Dr. Tania Reynolds
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The Fraternal Birth Order Effect and Male Homosexuality
One contributing factor to male homosexuality is the fraternal birth order effect. It's this interesting pattern where basically the more older brothers a man has, the higher the likelihood that he will be attracted to men. And so, what's hypothesized to be the mechanism there is that it's basically the mom's immune system recognizing the antigens produced by the Y chromosome. Her body is like "What the heck? I don't have Y chromosomes"
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