Justin, before you attempt to educate me on the subject of homosexuality click on the banner in my signature.
My oldest niece and her partner have been a couple for about 15 years so I understand that gay and lesbian couples can and do form lasting relationships, however, after 30 + years as an active gay man I can personally attest to the fact that gay relationships are transitory and for the most part superficial.
People use religion to justify bigotry. The Bible does not teach interracial marriages are wrong. Moses was in an interracial marriage, as were King David and his grandparents. The Civil Rights legislation of the 60's (BTW, I was in college) were passed to enforce a Constitutional Amendment. So you are comparing apples and oranges.
BTW, I have read What The Bible Really Says About Homosexuality. Have you read any other books on the subject?
As to the studies they are not available online, however you can read them in Archives of General Psychiatry - Fergusson et al. 1999, Herrell et al. 1999, Sandfort et al. 2001.