Так дело не в вере: точно сказать пока ученые не могут
http://news.bbc.co.uk/1/hi/sci/tech/2266135.stm
Previous research has suggested that fruit fly (Drosophila melanogaster) sexual orientation is genetically determined, although the neuronal pathways important for controlling sexual preference are unclear.
Dr Kitamoto sought to explore these issues through the introduction of the mutant gene called shibire into the midst of the fruit fly's neurons.
Dr Kitamoto told the BBC: "My interpretation is that male-male courtship is somehow inhibited by certain systems in the fly nervous system and using my method I think I inactivated those inhibitory systems so male courtship is induced."
http://www.sciencenews.org/sn_arc97/1_4_97/bob1.htm
http://cogprints.ecs.soton.ac.uk/archive/00002228/00/NEL220601R01_Muscarella_.pdf
Homosexual Orientation in Males: Evolutionary and Ethological Aspects
http://www.sciencedaily.com/releases/2003/06/030613075252.htm
Разве что на таком сайте уже все всем известно
http://www.france.qrd.org/assocs/apgl/documents/GLPCI_1.htm
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