The average adult penis size is about 6.2 inches or (157mm). It is interesting that in this study, penis size 'peaks' at age 17. Since penises do not get smaller as a male approaches age 21, it can be concluded that boys aged 16, 17, and 18 are most likely to exaggerate the size of their penises. Just a guess. (Several physicians suggested that the average penis size was about 6 inches, but they weren't measuring.) So, an average of 6.2 seems incorrect and maybe guys taking the survey exaggerated.
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5:35 PM on January 18, 2008