The ability of sperm to swim effectively is consistent no matter the country and highest in summer no matter the climate ...

A new study reveals that female sperm whales maintain an invisible genetic barrier, redefining their population ...

Previously unseen bacteria have been discovered inside beached pygmy sperm whales, baffling scientists due to their potential ...

Wellness brands are fueling a growing demand for male-fertility products, selling supplements and sperm-testing kits.

As more women start to question how hormonal contraception makes them feel, the rules around what counts as birth control are ...

Just because a female olive baboon has mated with a specific male doesn't mean he will be the father of her offspring.

Male infertility is more common than many people realize—and it often has treatable causes. Learn what factors can affect ...

Cornell scientists have taken a major step toward developing a safe, reversible, long-acting and 100% effective nonhormonal ...