yep I did in my late teens - it was only once, with my then-best friend. I thought I was over average, but man my friend was big.
It started when we got together one summer to play basketball, and then wound up back in his bedroom (we had been talking about hot girls all afternoon) and then came this really awkward silence broken only by the fact we were unflinchingly staring at each other's crotch and watching each other's bulges growing. It was kind of weird: We both new we both masturbated, were both uncircumcised, and both had a similar interest in always talking about our jack off sessions and comparing our dicks to others, but when it came down to actually showing each other we were both nervous (probably because we had been friends for so long and strangely had never been naked in front of each other). Anyway, David his name was, very carefully asked if I wanted to, you know, do it?
After the preliminary 'you go first' I finally just dropped my pants and showed him my half-hard dick. David then did the same and I literally gasped when I saw how big he was - half-hard at that. He had/has phimosis, so he couldn't retract his foreskin, but we both jerked off staring at each other's bulging hard ons. I admit I only shot a couple of feet that day, while David shot the wall on the other side of his room, but it was a great experience anyways.
That's my tale. It only happened once, but I'd do it again if I had the chance. | 
