CNN claimed there is skepticism about new HHS guidance that clarifies the differences between men and women, while failing to ...

A recent Trump executive order defines sex based on gamete size. But the order oversimplifies genetics, hormones and reproductive biology.

How do behavior, morphology and physiology act in concert to improve a male's reproductive success - and why is there so much variation among outcomes within and between species? Aa Aa Aa ...

While most animals reproduce sexually, some species rely solely on females for parthenogenetic reproduction. Even in these ...

In certain private schools, sex education is provided in fourth grade. The lessons are timed to coincide with mass circumcision for the boys, which the schools sponsor for free. The event gives ...