IF homosexuality is an inherited trait, why do genes for it survive? Because these genes may make women more likely to reproduce.
Andrea Camperio-Ciani’s team at the University of Padua, Italy, asked 98 gay and 100 straight men to fill in questionnaires about their families. They found mothers and aunts had more children if related to a gay rather than a straight man. Mothers of gay men averaged 2.7 babies, compared with 2.3 born to mothers of straight men. Aunts on the mother’s side had 2 babies compared with 1.5 for maternal aunts of straight men (Proceedings of the Royal Society B, DOI: 10.1098/rspb.2004).…
