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 ... Finally, in a few primate species, males use aggression or the threat of aggression ...

CNN claimed there is skepticism about new HHS guidance that clarifies the differences between men and women, while failing to ...

HHS said it was implementing Trump’s executive order directing the government “to recognize two sexes, male and female. These ...

Mating systems are important to understand ... which may negatively impact the female's reproductive output. The importance of male mate choice is controversial. Older theory predicts that male ...

While most animals reproduce sexually, some species rely solely on females for parthenogenetic reproduction. Even in these ...

The guidance defines female as a "person of the sex characterized by a reproductive system with the biological function of producing eggs (ova)," and male as a "person of the sex characterized by a ...

The Department of Health and Human Services, under the leadership of Robert F. | The Department of Health and Human Services, ...

The announcement comes in the wake of President Donald Trump’s Executive Order 14168, which affirmed the biological reality ...

While they promise advancements, there’s growing worry about their impact on human health, particularly male ... systems for ...

The fellows become experts in the management of male factor infertility, making use of state-of-the-art sperm function testing, genetic testing, and imaging studies. Decisions about assisted ...