Originally Posted by tore

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The last study I saw on homosexuality claimed to have discovered that genes that commonly cause homosexuality in men cause women to be more fertile. That means that if you are a mother and have those genes, your daughters who inherit those genes would have more children on average than women who do not have those genes. This is where the fitness benefit comes from which potentially explains why the trait is adaptive - why it has evolved. However, male children who inherit those genes may become gay.