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In 1996, The Advocate, a gay and lesbian magazine, asked readers what they believed the potential impact would be to the advancement of gay and lesbian rights if a scientific discovery is made that proves a biological basis for homosexuality. About 61 percent of the magazine readers asserted that such scientific research would advance the cause of gays and lesbians and lead to more positive attitudes toward homosexuality. For example, if one can be born gay, much like being born with blonde hair or brown eyes, then a fair society could not possibly condemn such an individual as being unnatural or immoral. To that end, gay activists and the liberal media have actively encouraged and pushed the idea that homosexuality is inherited and unchangeable, and researchers have diligently sought the scientific evidence to back up that claim. Unfortunately for the pro-homosexuality movement, the vast research on this subject has failed to establish any scientific evidence that shows a purely genetic basis for homosexuality. 

The controversy began with the work of Simon LeVay, M.D. in 1991, when he noted differences in the brains of 41 cadavers between homosexual versus heterosexual males. The hypothalamus, an area that is believed to regulate sexual activity, was smaller in homosexual males than heterosexuals. Although Dr. LeVay believed the brain differences proved the biological basis for homosexuality, he failed to consider a variety of reasons, other than genetic, that the brains were different. First, all 19 of the homosexual cadavers had died of AIDS, a disease known to affect the neurological system. Second, scientists who have studied the biochemistry of brains know that the way a person thinks affects the way his brain functions, specifically the neurochemicals released in the brain and the way certain pathways grow and change. Could the structural brain differences have started with the differences in thoughts between homosexuals and heterosexuals, not with genetics? Third, there is no proof that the hypothalamus size had any association with homosexuality, either as a cause for it or a result of it. 

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(Source: gotquestions.org)