Womb environment 'makes men gay'

actual picture of baby turning gay in the womb

Or, Yes, it's mamma's fault. I don't know why, but the headline to this article just makes me giggle.

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."