Tiny male spiders of a species common to the southeastern United States routinely remove one of their two oversize external sex organs. It’s an extreme act, but one that apparently enables them to run ...

Humans are sexual, meaning that both a male and a female are needed to reproduce. Each is equipped with specific organs capable of producing specific cells needed to procreate. In conjunction with a ...

Human genitalia evolved through development which has been chronicled by a team of researchers from Harvard University. Male snakes and lizards each possess a pair of penises, which evolved from ...

The correct development of two distinct sexes from a sexually undifferentiated, bipotential embryo is a multi-step process that is essential for mammalian reproduction. Disorders of sexual development ...