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Just a quick comment for those people not familiar with the endless nature/nurture debate . . . .
Every individual is equally a product of genes and environment. It makes no sense to ask how much of yourself is caused by one or the other. Without genes, you're a pile of dirt. Without the environment, you're a pile of dirt.
However, any difference between two individuals could be caused 100% by different genes, 100% by different environments, or anything in between.
So when you're asking about a "gay gene" or whatever, you're asking whether there's a measurable difference between two people, one who has the gene and another who doesn't, in sexual preference, on average.
Nobody is arguing complete determinism, either genetic or environmental.
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