Human testicles are much smaller, in proportion, to some of our primate cousins. Evolution can tell us why. But the size of ...

Rie Natsume and her collaborators have recently developed an innovative and cost-effective method for generating rats that ...

Scientists found microplastics in fluids around human eggs and sperm. Plastics from cookware and packaging affect human ...

Salty. Sweet. Bitter. Metallic. Sharp. Sour. You name the flavor, and there’s a high chance your sperm or semen will taste that way one day.

1. Low sperm count One of the most common causes of watery semen is oligospermia (low sperm count), which means your semen contains fewer than 15 million sperm per milliliter of semen.