Human penises vary in size on a number of measures, including length and circumference An adult penis with an erect length of less than 7 cm ( in), but otherwise formed normally, is referred to in medicine as a micropenis.
Penis sizes range in terms of length and circumference, and this article trawls the best Women don't want men with big penises; More penis.
Penis size - Sexual health. Some men go to extreme lengths to try to increase the size of their penis. Research has found the average erect penis size varies from around 13cm to 18cm (5in to 7in).