Re: How can gayness have a genetic basis?
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We can do calculus, even though that obviously was not selected for.
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The intellectual 'software' we use to perform those tasks very definitely was selected for, however.
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Nor would there necessarily be strong negative selective pressure, since critters can both reproduce and have gay sex.
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Indeed they can, but I don't see that they would inevitably tend to.
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Possibly, or rather, likely, some important trait that was selected for has a side effect of sometimes causing same sex attraction.
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How often would this trait occur? How could it occur with this ~10% figure we see today and still be evolutionarily fit? Even a 0.5% impedance of reproduction would have significant impact in the fulness of evolutionary time.
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