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 adult erect one is 5-6 inches, so if one is worried about being less than 4 inches, he can talk with his pediatrician. When non-erect, perhaps under 1.5 inches would be small. In the end, function will be more important than size.
Answered 12/29/2019
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