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Last updated on April 16, 2014 at 7:00 EDT

Latest Sexual differentiation Stories

2006-06-29 07:32:18

birth NEW YORK (Reuters Health) - A man's sexual orientation appears to be determined in the womb, a new study suggests. Past research by Dr. Anthony F. Bogaert of Brock University in St. Catherines, Ontario and colleagues has shown that the more older brothers a man has, the more likely he is to be gay. But it has not been clear if this is a prenatal effect or a psychosocial effect, related to growing up with older male siblings. To investigate, Bogaert studied 944 gay and straight...

2006-06-26 23:38:36

NEW YORK (Reuters Health) - A man's sexual orientation appears to be determined in the womb, a new study suggests. Past research by Dr. Anthony F. Bogaert of Brock University in St. Catherines, Ontario and colleagues has shown that the more older brothers a man has, the more likely he is to be gay. But it has not been clear if this is a prenatal effect or a psychosocial effect, related to growing up with older male siblings. To investigate, Bogaert studied 944 gay and straight men,...