A new study has discovered a biological reason for why many men with elder brothers tend to be gay. Researchers had previously noticed a correlation between having older male siblings and homosexuality but now, scientists at the Brock University in Canada have managed to trace it to time spent in the womb.
"Gay men have, on average, a greater number of older brothers than do heterosexual men“
http://www.ibtimes.co.uk/here-why-havin ... ay-1651093