Small, medium, large: Hard to find good, consistent info on penis sizes, but several doctors on HealthTap have offered opinions. It looks like the average erect one is 5-6 inches, so if one is concerned about being too long, he can talk with his doctor. By age 18, a penis is likely as long as it will get. There's no way to make a penis shorter, so what will be, will be. Doctor can examine, if a patient is worried.
Answered 11/2/2019
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