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There's no such thing as science pretty much determining something. Either it's a fact (They have pinpointed the gene) or it's a theory (Someone believes it, but have no proof.) Plenty of scientists speculate their theories as fact, but it's doesn't make it true until they can prove it.
Like I said, if it was genetic, there's no logic in that gene surviving evolution for hundreds and thousands of years. My own personal scientific theory is that it's a personal choice the individual makes. Until I see proof to the contrary, I don't think I'll be persuaded to believe otherwise.
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