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

In one of Robert F. Kennedy Jr.’s first moves as secretary of the US Department of Health and Human Services, the agency ...

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

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

The function of the male reproductive system is to produce sperm cells - male gametes - and release them inside a female. The male reproductive system has two testes (singular: testis).

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 ...

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

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

One of the most surprising findings was that the male stick insects had completely lost their reproductive function. In most ...

In his first few days as Health and Human Services Secretary, Robert F. Kennedy Jr. issued new health guidance that defines ...