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Random Interesting Article about homosexuals

Posted by Jeff (Guest) - Saturday, July 1 2006, 20:58:46 (CEST) from 69.14.30.71 - d14-69-71-30.try.wideopenwest.com Commercial - Windows XP - Mozilla Website: Website title:

Boys with older brothers 'more likely to be gay' (Filed: 26/06/2006) Boys are more likely to grow up gay if they have older brothers - because of biology, rather than upbringing. Ten years ago researchers made the startling discovery that the more elder brothers a boy has, the greater chance he has of being homosexual. For each additional brother that precedes him, a boy's likelihood of growing up gay increases by a third. At the time it was speculated that this was because boys with elder brothers are psychologically affected by their family dynamics in a way that influences sexual orientation. But new research published today in the journal Proceedings of the National Academy of Sciences (PNAS) shows this is not the case. The link between fraternal birth order (FBO) and being gay only exists when brothers have the same biological mother. Having older adopted or stepbrothers with a different mother made no difference to whether a boy turned out gay or straight. However, brothers sharing the same mother but raised in a separate family still exerted an influence. The discovery was made by Dr Anthony Bogaert, from Brock University in St Catherines, Canada, who with a colleague first uncovered the birth order link with homosexuality. Dr Bogaert did not conclude what biological factors influence the sexuality of homosexuals with elder male siblings, but previous research has shown that genetics and the womb environment can have a major impact on sexual preferences in both men and women. Certain parts of the body are affected by the male sex hormone testosterone during foetal development. Clues from the shape of ears, fingers, eyes and arms all indicate that lesbians are on average exposed to higher levels of testosterone in the womb. Evidence linking foetal testosterone exposure and male homosexuality is conflicting and less clear, but twin studies have demonstrated that sexual orientation can be inherited in both sexes. Dr Bogaert studied nearly 1,000 heterosexual and homosexual men in Canada who had either biological or non-biological brothers. --------------------- - BACK TO INDEX - REPLY - QUOTE - EDIT - DELETE -

The full topic: Random Interesting Article about homosexuals Jeff - Saturday, July 1 2006, 20:58:46 (CEST) Re: Random Interesting Article about homosexuals pancho - 07/02 03:37

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