In males, the testicles, scrotum, and penis grow in size during puberty. Researchers say the average size of an erect adult penis is 5.1 to 5.5 inches in length, but that is just an average, and teens ...

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.

Penis size figures prominently in discussions of the evolutionary biology of human reproduction and mate choice. Yet serious research lags well behind a pop culture driven by myths that few bother to ...

Although genetics can play a role in penis size, many other factors can also affect penis size, including hormones, nutrition, and diet. Factors such as height and shoe size do not affect or indicate ...