Growing up with lots of sisters makes a man less sexy. For rats, anyway. A new study finds that the sex ratio of a male rat’s family when he’s growing up influences both his own sexual behavior and how female rats respond to him.
Growing up with lots of sisters makes a man less sexy. For rats, anyway. A new study finds that the sex ratio of a male rat’s family when he’s growing up influences both his own sexual behavior and how female rats respond to him.