Origin of homosexuality unresolved despite study

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Even presidents don't have an answer to questions about the origin of homosexuality.

And it's no wonder. Science doesn't have a clear answer either.

During the third presidential debate, moderator and CBS News correspondent Bob Schieffer asked the candidates, "Do you believe homosexuality is a choice?"

"You know, Bob, I don't know. I just don't know," said President Bush, who then urged tolerance, respect and dignity for homosexuals.

"We're all God's children," answered Sen. John Kerry, the Democratic presidential nominee. Referring to Mary Cheney, the lesbian daughter of Vice President Dick Cheney, Mr. Kerry said, "She would tell you that she's being... who she was born as. I think if you talk to anybody, it's not choice."

So what does science say?

Is homosexuality inborn? Is it caused by outside influences? And, regardless of where it comes from, can it be changed? The answer to all three questions is: yes and no.

If lawmakers, judges, educators and the public are frustrated by such answers, it's because they've been bombarded all year by supporters and opponents of same-sex "marriage," who have boiled research down to their favorite sound bites.

"Decades of research all point to the fact that sexual orientation is not a choice and that a person's sexual orientation cannot be changed," say homosexual rights groups such as Human Rights Campaign, which are flanked by the nation's premier medical, mental-health and therapy professional groups.

"There is no scientific research indicating a biological or genetic cause for homosexuality," counters the National Association for Research & Therapy of Homosexuality (NARTH). Homosexuals who want to "can grow into their heterosexual potential" through "psychological therapy, spirituality and ex-gay support groups," adds NARTH, which has allies in traditional-values and religious groups.