When I was 13 to about 17 I was in the boy scouts. All we did was talk about girls and sex as we were young and discovering the world of sex. My friends and I would openly discuss our hard-ons and how often we masturbated.
We always had our scout meetings at a church on Monday evenings. Quite often our parents would drop us off an hour early just so we could run around and play with our friends before scouts started.
One particular evening two friends and I were talking about sex and girls at school we had heard would 'put out', etc. Three of us got into one of the stalls in the men's rooms and one of the guys said 'let's compare hard-ons.' We all stood around the stool and dropped our pants exposing our rigid upright equipment. One guy I'll call Dave said 'this is how I jack-off' and he started stroking his dick. I said 'this is how I do it' and started stroking mine with a slightly different grip. The third guy showed us how he did it. We all three stood there jacking-off watching each other.
Dave said he wanted to feel how hard we each were so he felt mine and gave it a few strokes and we each did the same. Eventually we stood there, each guy doing the guy to his right in our tight little circle of three. I can't remember who came first but it was like a catalyst and suddenly all three of us were squirting our cum.
We never did that again, but several times after school when Dave's parents were still at work, Dave and I would jack off together looking at some old girlie magazines he had well hidden in his room.
None of us were gay then and none of us are gay now. We all started dating girls and went to college, got married and have families, although we have all moved away and haven't seen each other in years. I believe what happened is probably very common as boys discover themselves and sexuality.
Today, years later, I can still think about those fun times and I still get a hard-on as I remember jacking off with my friends in that bathroom stall. It is ironic that it happened in a church of all places!