We are who we are, and our sexualities are part of human nature. But genes contribute only about one-third of the variance, maybe even less for women. Archives of Sexual Behaviour34, Social Science and Medicine56, You may have already requested this item. Part of the conduit linking the left and right sides of the brain the corpus callosum is larger in homosexual men and straight women Witelson et al,
Sexual orientation is a very fundamental part of our nature that is established by the time we are born.
'Gay genes': science is on the right track, we're born this way. Let’s deal with it.
This is part of the series: The brains of straight men and lesbians are larger in the right hemisphere than the left, but in gay men and straight women the two sides are symmetrical. Because identical twins share the same genes this implies that finger ratios and sexual orientation are simultaneously affected by the uterine environment. I n a recent Guardian articleSimon Copland argued that it is very unlikely people are born gay or presumably any other sexual orientation. Where are gays found?
There is a tribe in the New Guinea highlands called the 'sambia', where the practice until recently was for younger boys to be isolated from all female company and to fellate older boys in order to ingest their virility. Testing the idea that this might be a biomarker of prenatal sex hormone exposure, I showed that women describing themselves and assertive and competitive were more likely to have a masculinised 2D: Apart from being a professional psychologist, Dr Wilson trained as an opera singer at the Guildhall School of Music and Drama in London and still undertakes professional engagements as an actor, singer and director. Not one to shy away from contention, his most recent books include: There is no one "'gay gene"'.