When I was 15 we had a tight little group of friends. We did almost everything together. There were two guys and three girls, ranging in age between 13 and 15. As we were friends we did not date each other. One day, we were talking about sex. Eventually, we started telling about masturbation. Eventually, we all admitted to doing it fairly frequently.
Finally, we all suggested why don't we do it together? No sex, only masturbation. Well, hell, did we all drop our shirts, panties etc. One of the guys was 13 and had a pretty skinny penis. He had hair, but it was blonde and pretty sparse. One of the girls also did not have much pubic hair and was very flat, being 32 A. The rest, including me, were pretty normal for that age.
Since we were over at Brett's house and his parents had just left for the evening, we sat around and looked at everyone's privates. We could touch each other, but no sex. I pulled by lips apart, let Brad look real close and then lick my nipples. I in turn pulled back Brett's foreskin and stimulated his balls. I think I got the biggest rush in touching Sue, the blond flat girl. I loved it with very little hair in the way. When everyone was very aroused we all sat back on the couches and did ourselves.
We did this many times. Sometimes we did it all together and sometimes just with one other person from our group. Everyone liked it when I became the first person to shave. I loved it when Brett followed suite a couple of weeks later!