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JackTheBandit · 3929 days ago · link · · parent · post: How can a trait like male homosexuality persist over evolutionary time ?
I'm almost 99.9% sure that this is the answer to the question posed. homosexual people are in heterosexual relationships and producing children. One could ask, well, does that mean every homosexual offspring has at least one (1) homosexual parent? Probably not, but I'm willing to bet the number is at least statistically significant and genetics makes up the other large portion.