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“Consider, too, that across cultures, the proportion of the population that is homosexual is roughly the same. We are left with an undeniable evolutionary puzzle: What maintains the underlying genetic propensity for homosexuality, whatever its specific manifestations? Unlike most mystery stories, in which the case is typically solved at the finish, this one has no ending: We simply do not know.”

~David P. Barash in The Evolutionary Mystery of Homosexuality

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