Can you provide a link to that?
Conclusive evidence that a person is born with a homosexual orientation?
See Missourian, I get the point you're trying to get across. And personally? We're going to agree to disagree. Homosexuals are citizens too who deserve equal footing under the law. Does this mean other people's rights should be violated? No. However, this does not mean that their rights should be violated either.
The fault in this case lies with those in the Government who feel that they have a right to define what marriage is. Instead of giving everyone equal footing under the law by making all legal unions, civil unions, they have created this situation.
As a Social Libertarian really, this is the sort of behavior that makes this country not what it is suppose to be.
As for what you're looking for, there is no "conclusive" evidence that you'll accept, we both know it. However, Homosexuality is not a choice. It's all about biology.
Sexual orientation among men is connected with brain metabolism, University of Chicago research shows
Plus, there are plenty of species of animals in the wild that have homosexuals in that species.
And not to take a cheap shot at anyone. But for the religious people to ask for conclusive evidence about Homosexuality being something you're born with but at the same time saying that they do not need to prove that there is a God is irony at it's best.