this is interesting :

source:
http://www.timesonline.co.uk/printFriendly/0,,1-210-2524408-523,00.html

Experiments that claim to ‘cure’ homosexual rams spark anger

SCIENTISTS are conducting experiments to change the sexuality of “gay” sheep in a programme that critics fear could pave the way for breeding out homosexuality in humans.

The technique being developed by American researchers adjusts the hormonal balance in the brains of homosexual rams so that they are more inclined to mate with ewes.

It raises the prospect that pregnant women could one day be offered a treatment to reduce or eliminate the chance that their offspring will be homosexual. Experts say that, in theory, the “straightening” procedure on humans could be as simple as a hormone supplement for mothers-to-be, worn on the skin like an anti-smoking nicotine patch.

(...)

Peter Tatchell, the gay rights campaigner, said: “These experiments echo Nazi research in the early 1940s which aimed at eradicating homosexuality. They stink of eugenics. There is a danger that extreme homophobic regimes may try to use these experimental results to change the orientation of gay people.”