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Sex determination is complicated, and the biological causes of transsexuality are not completely understood. I'd expect that as we understand more about the causes, we'll have a better idea whether hormone levels should be the gold standard for ruling an individual out of competition.
I think it is all we've got right now, but it seems (to me) to be a fairly blunt instrument given that every situation has its own biological and psychological underpinnings, and seems quite complex.
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And we have just one world, But we live in different ones
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