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).
Average penis sizes in uk show men in Wales have the longest penis measuring in with an average of inches.
AS ULRIKA Jonsson pokes fun at the size of ex Brian Monet's todger, a graphic reveals the average size of a man's erect penis from all over the world.