Our expert says:
the size of your penis is within the normal range (12-17 cms when erect). Guys are different sizes and some are bigger than others. Masturbation does not affect penis size and you will not have caused growth stunting by masturbating.
Remember that a lot of pictures of guys may have been taken because they have a particularly large penis (as in porn etc), and that this is not representative of the average male in the same way that catwalk models are not representative of the average female body.
So Kevin things are ok, and also remember that guys physical development does continue into the early 20's.
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