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Gayness is a cultural phenomenon, and quite a young one. It's impact on the spread of genes probably has had zero effect on the gene pool. Until recently, homosexual sex didn't preclude one from having a family. Nobody identified as "gay" until very recently in evolutionary terms, even though males have been having sex with males since long before the dawn of man. For a measurable effect on inheritance, we'll have to wait a lot longer than a handful of generations.