The chromosome associated with male development, which is the last mysterious piece of the human genome, has been fully sequenced by a team of more than 100 researchers around the world, including ...

Human sperm cells travel up to 6 meters in their transit from testes to penis, and most of that journey occurs in the epididymis, a tightly coiled tube that primes the cells for their ultimate task: ...

The Y chromosome is perhaps the most puzzling part of the human genome. Associated with male development, it is chock-full of repetitive and inverted stretches of DNA, a hurdle that makes it ...

Medically reviewed by Kelly Wood, MDTestosterone levels peak during male puberty and decline with age in both males and females. With low testosterone in males, you can have a decreased sex drive, ...

Human reproduction requires both male and female gametes. Gametes are special sex cells that contain the genetic information necessary to create a new life. Men produce millions of gametes called ...

It’s not just about chromosomes. Or reproductive cells. Or any other binary metric. Many genetic, environmental and developmental variations can produce what are thought of as masculine and feminine ...

Men whose mothers were exposed to stressful life events while they were in the first 18 weeks of pregnancy may have reduced sperm counts when they become adults, according to a new study. Men whose ...

Many unplanned pregnancies end in abortion, but options for male birth control are limited. Gender bias, along with other factors, may be slowing development. There cannot be equity in family planning ...

A homeless kitten has been found in the U.K. with no internal or external sex organs. The cat, which is 15 weeks old and in otherwise-perfect health, has been named Hope by the Cats Protection center ...