[Bill Haywood]

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Oral histories of gays are very telling. Time after time in coming out stories people describe their desperate attempts to be straight, often lasting for decades. For them, it's clearly of biological origin.

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No, not really. Few people can understand and control the basis of their urges, many of which arise from something as simple a childhood experience, or wiring that gets crossed during childhood between affection and sexual attraction toward males.

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Are you conflating biological and genetic? I purposefully specified a biological basis, not a genetic. "a childhood experience, or wiring that gets crossed" are exactly the sorts of things I wanted to allow for as possible causes. By biological, I mean a powerful trait beyond choice. It might be genetically "intended," or it might be a variant in development after conception ("childhood experience" or "crossed wires"). Or both. There has to be a genetic element, but I think the post-conception explanations have momentum.

The oral histories demonstrate there is something inexorable about homosexuality, for at least many gays. This means the OP has to inquire about the biology (whether genetic or developmental or both), even though evolution makes it confusing. That was my point.

And I would say that foot fetishes and the like are also biological, in that they are intense urges emanating from brain structure, not the result of a fad or a weak, sinful will. But I think we can safely say that foot fetishes were not selected for, yet there they are.

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Many behavioral traits are partly genetic. But how large is the effect? Can you get me a %?

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Asked and answered. I'm not suggesting specific coding as the explanation.