In the United States, more than 11% of men under the age of 49 are infertile. While the causes are varied and range from infections to hormonal imbalances, deformities during meiosis—a specialized ...

Worried masturbation will lower your sperm count A urologist explains why this is largely a myth and what actually affects ...

The sperm tail is a modified motile cilium analogous to those found in tissues including the lung and brain. They have been evolutionarily sculpted to optimize motility and, therefore, fertility, ...