Semen is a fluid that carries sperm, or male reproductive cells, out of the body during ejaculation. The average amount of ...

If you were thinking of kicking off tonight’s foreplay with some oral sex for your partner with a penis and planning on swallowing once your partner finishes, you might be wondering what exactly is in ...

In her new book "The Stronger Sex," science journalist Starre Vartan dispels myths and misconceptions about the female body. When you purchase through links on our site, we may earn an affiliate ...

After struggling with infertility, these men sought out sperm donors to help them become dads. (Photo illustration: Yahoo News; photos: Getty Images) For men who experience infertility, the use of ...

In the United States, an estimated 645,000 men ages 20 to 50 have azoospermia, a condition in which no sperm are present in their ejaculate. Now, scientists are testing a potential treatment: ...

This essay is part of a series on environmental health. I can’t remember when I learned that women’s fertility starts to wane in our 30s; it feels like I was born knowing that my eggs had a sell-by ...

(Reuters) - Autumn is the time of year most associated with bumper crops of new babies, and according to an Israeli study there may be a scientific reason for it: human sperm are generally at their ...

A man in his early 20s received a transplant of his own sperm-producing stem cells, which had been frozen since his childhood, in an attempt to regain fertility. Doctors are waiting to see if the ...

NEW YORK (Reuters Health) - Autumn is the time of year most associated with bumper crops of new babies, and that may be because human sperm are generally at their healthiest in winter and early spring ...