When I was 15 years I slept over at a friends house. He was very open-minded and wasn't shy at all. So we talked about sex and stuff all night long. When we got to bed, he had an idea, to play a little game. Something like truth or dare. First we both took our underwear off. Then, we both had to say whether or not we were bigger that the other. I you said that you had a bigger penis and you hadn't, you had to jerk the other one.
He thought that he was bigger but he wasn't ;). So he jerked me a little while. Off course I jerked him a little too that night.