Smaller Testes, Better Father?

It takes balls to be a good dad—but a big pair may not work in the child's favor. A study involving 70 fathers found the size of a man’s testicles is indicative of his commitment to child-rearing, and that men with small ones are more likely to display good parenting skills. Researchers say this boils down to biology: men with larger testes are more inclined to spread their seed (read: abandon their home lives). But before you get out the scale and measuring tape, consider this: “It could be that when men become more involved as caregivers, their testes shrink,” said the study author. “Environmental influences can change biology.”