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Womb environment 'makes men gay!'
A man's sexual orientation may be determined by conditions in the womb, according to a study. Previous research had revealed the more older brothers a boy has, the more likely he is to be gay, but the reason for this phenomenon was unknown.
But a Canadian study has shown that the effect is most likely down to biological rather than social factors.
The research is published in the journal of the Proceedings of the National Academy of Sciences. Professor Anthony Bogaert from Brock University in Ontario, Canada, studied 944 heterosexual and homosexual men with either "biological" brothers, in this case those who share the same mother, or "non-biological" brothers, that is, adopted, step or half siblings.
These results support a prenatal origin to sexual orientation development in men Professor Anthony Bogaert
He found the link between the number of older brothers and homosexuality only existed when the siblings shared the same mother.
The amount of time the individual spent being raised with older brothers did not affect their sexual orientation.
'Maternal memory'
Writing in the journal, Professor Bogaert said: "If rearing or social factors associated with older male siblings underlies the fraternal birth-order effect [the link between the number of older brothers and male homosexuality], then the number of non-biological older brothers should predict men's sexual orientation, but they do not.
"These results support a prenatal origin to sexual orientation development in men."
He suggests the effect is probably the result of a "maternal memory" in the womb for male births.
A woman's body may see a male foetus as "foreign", he says, prompting an immune reaction which may grow progressively stronger with each male child.
The antibodies created may have effect the developing male brain.
In an accompanying article, scientists from Michigan State University said: "These data strengthen the notion that the common denominator between biological brothers, the mother, provides a prenatal environment that fosters homosexuality in her younger sons."
Story from BBC NEWS:
http://news.bbc.co.uk/go/pr/fr/-/1/h...th/5120004.stm
I've read some rubbish in my time but this one must be top of the list!
A man's sexual orientation may be determined by conditions in the womb, according to a study. Previous research had revealed the more older brothers a boy has, the more likely he is to be gay, but the reason for this phenomenon was unknown.
But a Canadian study has shown that the effect is most likely down to biological rather than social factors.
The research is published in the journal of the Proceedings of the National Academy of Sciences. Professor Anthony Bogaert from Brock University in Ontario, Canada, studied 944 heterosexual and homosexual men with either "biological" brothers, in this case those who share the same mother, or "non-biological" brothers, that is, adopted, step or half siblings.
These results support a prenatal origin to sexual orientation development in men Professor Anthony Bogaert
He found the link between the number of older brothers and homosexuality only existed when the siblings shared the same mother.
The amount of time the individual spent being raised with older brothers did not affect their sexual orientation.
'Maternal memory'
Writing in the journal, Professor Bogaert said: "If rearing or social factors associated with older male siblings underlies the fraternal birth-order effect [the link between the number of older brothers and male homosexuality], then the number of non-biological older brothers should predict men's sexual orientation, but they do not.
"These results support a prenatal origin to sexual orientation development in men."
He suggests the effect is probably the result of a "maternal memory" in the womb for male births.
A woman's body may see a male foetus as "foreign", he says, prompting an immune reaction which may grow progressively stronger with each male child.
The antibodies created may have effect the developing male brain.
In an accompanying article, scientists from Michigan State University said: "These data strengthen the notion that the common denominator between biological brothers, the mother, provides a prenatal environment that fosters homosexuality in her younger sons."
Story from BBC NEWS:
http://news.bbc.co.uk/go/pr/fr/-/1/h...th/5120004.stm
I've read some rubbish in my time but this one must be top of the list!
Right........ 
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