Quote:
"Since sexual orientation is such a complex trait, we're never going to find any one gene that determines whether someone is gay or not," says Mustanski. "It's going to be a combination of various genes acting together as well as possibly interacting with environmental influences."
Previous studies in male twins have suggested that between 40%-60% of the variability in sexual orientation is due to genes. The rest is thought to be due to environment and possibly other biologic but nongenetic causes.
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http://www.webmd.com/sex-relationshi...there-gay-gene
What happens if someone has such a genetic makeup but due to 'possibly other biologic but nongenetic causes' is not gay ... must that someone accept that he/she is gay and embrace homosexual behavior, because obviously 'choice' is not a variable?