The alpha male silverback's intimidating figure gives him near exclusive access to the females in his group, so his sperm doesn't compete with other males' sperm within the female reproductive tract.

New research suggests that microplastics could be affecting male fertility It's the latest corner of the human body where tiny bits of plastic have turned up -- the testicles.

An Alabama Senate committee advanced a bill to define an individual’s sex based on reproductive anatomy. Senate Bill 92 “would define man, woman, boy, girl, father, mother, male, female, and sex for ...