NARTH is... not exactly an organization that I'd go to for an unbiased view of the question of whether or not homosexuality is genetic. :P They were formed in response to the 1973 decision by the American Psychiatric Association to remove homosexuality from its list of mental disorders. They are associated with many fundamentalist Christians, despite their claims to be a secular organization.
The question of whether or not there is a gay gene is not really the appropriate question to ask, and doing so is, in a way, falling into the trap of those who want people to believe that homosexuals are depraved or sick or whatever. The questions to ask, instead, are "Can sexual orientation be changed?" and "If it is, should we attempt to change sexual orientation?"
The answer to the first question seems very likely to be "no". The twin studies that they cite as evidence against this gay gene have really shown that there actually is a strong correlation between genetic similarity and chances of being homosexual. They do not show that there is a perfect correlation - indicating that it is not purely genetic - but nonetheless if it is even at all genetic, that makes it likelier that it is something inborn rather than simply a choice. But the evidence doesn't stop there - research has shown that the very structure of the brain of a homosexual person resembles that of the opposite sex. This really ought to be a stake through the heart of the idea that sexual orientation is a choice - but I know very well it won't be for those who begin with conclusions and then look for evidence.
So, it seems pretty darn likely that sexual orientation is not simply a choice, and thus, is not something that can be changed (short of a lobotomy). But even if it were, the answer to the second question seems also likely to be "no". Despite the doomsday scenarios some dream up around an acceptance of homosexuality, there is no real evidence that homosexuals are particularly different than heterosexuals, except of course for their sexual orientation. There is no evidence that they are less happy (when not being harassed by homophobic people, that is); there is no evidence that they are more prone to crime or deliquency... by all accounts, they're just regular people, like you or me.
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