Here's the problem with the "gay gene" theory... if there is a gene for homosexuality, then there is probably also a gene for pedophilia or necrophilia. Gays talk as if they can't help it... oh really? So does that mean all gay people are attracted to all members of the same sex? They can't help themselves but try to hump someone of the same gender who gets too close to them? Don't they have any choice over their self-control? Of course they do.
Also, nobody is 100% gay or 100% straight. The notion that sexuality is predetermined makes no sense, and leaves no room for people who are bisexual, or people who have had homosexual relations but now are happy in heterosexual relationships. Homosexual behavior is a high level activity - there may be genes which predispose people towards being masculine or feminine and depending upon environmental considerations they may be attracted to one sex or the other, but that's a lot different from saying, "I was born gay." There is no conclusive evidence - we are nowhere near so advanced in the field of genetics where we can map DNA sequences to very high level behavior.
It's important to also recognize that just because someone might believe there is no "gay gene" does not mean they are homophobic. Just like if you don't think "alcoholism is a disease" it doesn't mean you hate alcoholics. It means you have an issue with the deployment of pseudo-science into areas where it isn't proven or appropriate.
There is no "gay gene." With that being said, I am all for gay rights and I support gay people wanting to get married, have civil unions and *especially* being able to adopt and raise children. I just think they do a disservice to humanity to play the "gene card" and suggest they're different and special and can't help it. You can choose who you want to have sex with. That is a choice.
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