Well, if you dig it up, I'd be glad to read about it, but sorry, I can't believe there is a legitimate biological factor that causes sexual attraction.
If you think about it, attractions are all based on external factors and determined by life experiences - how you were brought up, your relationship with other family members, childhood memories both traumatic and happy, etc.
You're never going to convince me that there's some kind of gene that causes one to go va-va-voom when eyeing that special someone. Once you go that route, then you have to say the same for other sexual deviancies. Do you believe that a pedophile has a gene that causes him/her to be attracted to children?
Sexual deviancy is a chosen behavior BUMP!
Then again, as posted above, perhaps they are angling to promote it as a "genetic issue" and request entitlements. I'd suggest it may surprise them when they learn what society feels they are truly entitled to...
And also, as posted above, if someone can fool society into believing that homosexuality is genetic, will they demand protection for the "unborn homosexual"? Will it then be perceived as persecution? Will such an abortion then become a "Hate Crime"?
Elect more Democrats and perhaps we'll find out.