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 ...

Sex is widely understood to refer to a label assigned at birth based on one’s anatomy that ... the size of reproductive cells, hormone levels, internal organs or genitals.” ...

Male and female reproductive systems allow human reproduction ... giving insight to the human body and its capabilities. BBC Teach has thousands of free, curriculum-linked resources to help ...

The Male Reproductive Medicine and Surgery fellowship is a one-year fellowship under the mentorship of Larry Lipshultz, M.D., professor of urology and the Lester and Sue Smith Endowed chair for ...