If you have ever been concerned about your penis size, you're not alone. The size of the male sex organ has long been thought to be an indicator of a person's testosterone levels and sexual abilities.

The average penis is between 5.1 and 5.5 inches, with one study finding that nearly everyone falls within this range. Penis enlargement methods do exist, but many may be harmful, do not work, or only ...

James is a published author with multiple pop-history and science books to his name. He specializes in history, space, strange science, and anything out of the ordinary.View full profile James is a ...