Boys with older brothers 'more likely to be gay'

[WhiteTara]

http://www.telegraph.co.uk/news/main.jhtml?xml=/news/2006/06/26/ugay.xml&sSheet=/news/2006/06/26/ixnews.html

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.

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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.

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