This happened last week.
I go swimming and work out often at my college gym. I have been going there for three years now, so I am pretty fit.
This time though, things went a bit differently than normal. I got to the gym about six in the evening and worked out for about an hour. Then, I went back to the locker room to change into my suit to go swimming. To enter the pool from the men's locker room, one has to walk through the shower room, which is very large and open with about eight poles and probably three heads off of each pole. When I went into the room, there was a very fit guy taking a shower, but I did not pay too much notice; there are often other people in there. So I went up the stairs to the pool.
The pool was crowded with other swimmers and an aqua fitness class, so I waited, and waited, and waited. After about ten minutes of nobody leaving and the class still going on, I left.
Going back down the stairs, I noticed that the same bloke was in the showers. Not too strange, but that is a long shower to take in the public area! Anyways, I went to my locker, stripped off, and went back to the showers.
I chose a shower one pole away from the other bloke and started cleaning myself away and noticed that he was giving me a few glances; no big deal, people usually do (not just me, but people in the showers in general catch looks). He also had a semi with huge balls, much larger than I. Another guy came in, rinsed off real quickly and left.
By this time, I had a semi but was not planning on anything. The other bloke was not facing my direction, but then slowly turned towards me. He had a rock hard cock! I touched myself, but nothing big, just a little tug, to let him know that it was OK. He then started stroking his cock right in front of me. I started doing the same. We looked at each other a few times, and he gave me a few smiles; I did the same. Nothing was said, just two blokes wanking off.
A few minutes went by, and I got kinda scared, I mean, we were in a very public place, and could easily get caught. So I turned off my shower and left without finishing off. Right when I started toweling off, another bloke came into the shower room, so it's a good thing we quit. I guess that he may have joined in, but I'll never know.