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What causes homosexuality? The predominant understanding is that the causes are genetic, but this seems to be in conflict with the notion of natural selection: an individual who does not reproduce is a dead-end for the genes that they carry; therefore, the 'gay gene' should have gone extinct. A number of hypotheses have been proposed, attempting to resolve this paradox, but they are not very convincing. In this post I present a couple of my own hypotheses, which I believe do a better job at resolving the paradox.