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 ...

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

The vagina, or birth canal, connects the cervix to the outside of the body. In male reproductive organs, the scrotum holds the testes, which produce sperm and sex hormones, including testosterone.

Medical experts reveal the surprising connection between tight jeans and fertility issues, easy ways to protect your ...

At the same time, the female reproductive organs associated with sexual reproduction showed signs of degeneration. One of the biggest hurdles in this research was obtaining specimens. "In fact, we ...

Their analysis of male reproductive behavior reveals new ... At the same time, the female reproductive organs associated with sexual reproduction showed signs of degeneration.

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 ...

While sexual reproduction is the predominant strategy among animals, some species have evolved the ability to reproduce asexually ...