Imagine a future where a diagnosis of untreatable male infertility is no longer the end of the road—because science has found ...

And it's a reality that's definitely not limited to male and female ... remember learning in high school biology that all the genetic information in the human body is packaged into 23 pairs ...

A human’s sex is genetically determined. One of our 23 pairs of chromosomes carries genes that determine the embryo’s sex; ...

If testes develop, they begin producing androgens—male-promoting steroid hormones ... For these and other reasons, human biology is not binary. Ari Berkowitz, Ph.D., is a Presidential Professor ...

Toxoplasma gondii, a parasite spread by cat feces, may damage sperm and disrupt male fertility, new study finds.

A January executive order by President Donald Trump designates people as female if they make the “large” reproductive cell (the egg) and male if they make the ...

A recent study led by the University of Eastern Finland explored sexual selection in humans by investigating whether female ...

A surprising finding from researchers in Japan has shown how an environmental factor can influence the development of sex organs in unborn mice. The discovery challenges the longstanding belief that ...

cleanly or “immutably” divided between the categories of female and male. This administration’s definitions of “sex” are intentionally designed to mislead the public about human biology.

Injected into male mice, the drug was 100% effective in preventing pregnancy for 2½ hours and about 91% effective for up to 3 ½ hours, according to a study published Tuesday in the journal ...

Ironically, the concept of the alpha male human is shaped by culture rather than biology, as it reflects restrictive expectations from wider society of what constitutes masculinity. The ...