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"If it's not genetic/heritable then it must be choice." is incorrect.
Something can have a biological basis, yet have no genetic component. Fingerprints are not heritable, indeed identical twins will have different fingerprints, but no one chooses their pattern.
Sexual orientation could similarly be left to the chance vagarities of the prenatal environment. Set down from birth, a completely biological basis, but no strict heritability of the trait at all.
Seriously though, WillyPete, I want to hear about when you chose between being attracted to girls or being attracted to boys.
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Simple Machines in Higher Dimensions
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