older brothers

Scientists believe they may now know why gay men tend to have more older brothers. A new paper in the Proceedings of the National Academy of Sciences by Anthony Bogaert—the culmination of more than 20 years of research—shows that antibodies to one particular protein may be responsible. Bogaert, a human sexuality researcher at Brock University in Canada, first began looking at what is now known as the “older brother effect” in 1996. Basically, what Bogaert and his collaborators found is that having older brothers increases the chances a man will be gay. In 2006, they published a study showing that … Read more