@abpb279
good question that i do not think anyone has an answer to yet. being gay or lesbian is a sexual orientation that an individual chooses and may not have anything to do with their biological predisposition. the development of male or female characteristics however is determined by a balance between the male and female hormones, a function that is primarily controled by the testes early in development and the pitituary gland and ovaries. there have been studies to try an identify the genes or things that can be used to explain why some people are gay ut none has been conclusive. more work on this is on going as it is some kind of hot topic at the moment. there are also many studies that suggest that being gay is purely from how someone was brought up or who and what they interacted with. in kilifi for instance, there was a study on men who have sex with men and they found that alot of sexual experiences for young boys started as homosexual, changed to heterosexual ie male female once they got to marriage age, and reverted back to homosexual in old age. you could argue that the revertion is due to hard wired biological reasons and heterosexual marriage was due societal pressure, but it could also be due to reverting to old habits due behavioural conditioning
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