How can gayness have a genetic basis?

[CrayZee]

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This is what seems intuitively to me to be the case. But I don't see how this could come about from an evolutionary point of view.

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Why not? Many things observed in nature are normal distributions. And I would be very surprised if sexuality was not normally distributed as well. If it was possible to accurately survey human sexuality I bet you'd find a normal distribution clustered around straightness.

Some things may not serve a clear, obvious evolutionary purpose yet still evolve, I'd imagine.