When I masturbate i have ths pain it is in my legs just under my butt. I never have this pain any time else. I am not sure what I am asking but its posted any way. Yay First post I am 13 and a guy
Welcome to AfraidToAsk, Heto! I don't know what the pain is, though.
Its possible that your penis is stretching your penile ligiment (the part that is inside you) it may be a part of normal growth. If you tense up your bum muscles too much, that would be another cause.
This Shits The Shit
pro. just growing pains!