Simon LeVay is a scientist who also happens to be gay. Here is what LeVay said regarding his own research:

"[His 1991 research] made the unassuming LeVay one of the most misunderstood men in America. "It's important to stress what I didn't find," he points out with the courtly patience of someone who long ago got used to waiting for the rest of the world to catch up. "I did not prove that homosexuality is genetic, or find a genetic cause for being gay. I didn't show that gay men are 'born that way,' the most common mistake people make in interpreting my work. Nor did I locate a gay center in the brain--INAH3 is less likely to be the sole gay nucleus of the brain than part of a chain of nuclei engaged in men and women's sexual behavior. My work is just a hint in that direction--a spur, I hope, to future work."

Source: Interview with David Nimmons (March, 1994) "Sex and the Brain", Discover, Vol. 15, No. 3, p. 64-71.

In 1973 the APA (American Psychiatric Association) declassified homosexuality as a mental disorder. According to LeVay, it wasn't science that propelled the APAs change, he said

"Gay activism was clearly the force that propelled the APA to declassify homosexuality."

Dr. Spitzer is best recognized in psychiatric history for his scientific role in 1973—he led the team that investigated whether homosexuality should be removed from the psychiatric manual. Since then Spitzer has changed his mind that homosexuals can change.

"Like most psychiatrists," says Dr. Spitzer, "I thought that homosexual behavior could be resisted--but that no one could really change their sexual orientation. I now believe that's untrue--some people can and do change."