When I was 16 or 17 years old my friends and I liked to go swimming nude late at night. One night we had been discussing where we were going to go that night. We had decided on the local golf course in one of the ponds. We piled into the car and headed out.
We got to the course and climbed the fence. Once we got to the pond we all stripped down naked and jumped in. We always swam around and talked about girls. We had never previously masturbated together. In fact I had never even seen another erect dick. But this time I was so horny and turned on that I had a huge hardon. I didn't want to get out of the water but it wouldn't go away.
When everyone was getting ready to wrap it up I announced that I had a huge boner and needed to shoot my load to get rid of it. Then another guy piped up and said that we should all get together and race. Everyone slowly came around and it was decided that we would gather around the flag at the nearest green and try shooting in the cup.
By the time we all gathered around there were six hard dicks pointing at each other. The race began and I couldn't believe I was in the middle of my first circle jerk. The first guy to shoot his load didn't get any in the cup. I was second and shot some in the cup and most on the feet of the others then the remaining guys purposely shot their loads on the feet of the others.
For not being gay, this was one of the hottest experiences of my life to that point. Having another guys cum on my body was amazing. Needless to say that was just the first of many circle jerks. Since then we have moved on to shooting cum on each others dicks to stroke off with. That is awesome!