In public locker rooms, I used to be so self-conscious of getting an erection. I would change clothes quickly, or I would take my time and take a shower when the locker room wasn't busy. One time, in gym class, I quickly put my jockstrap on and one of my testicles was hanging out. I didn't realize it and a few guys around my locker kept making fun of me.
At the gym I used to go to, I often ran into this one guy. I always thought he was a very attractive guy. I definitely had a huge crush on him. He had a nice hairy athletic body with a beautiful 6 pack. Our lockers were across from each other in the locker room with a bench in the middle. When he changed clothes he was good at doing the towel dance and quickly leaving. I only saw his dick a few times, it was about 4" soft with a pair of big balls. One day, when I had finished working out, I was surprised to see him sitting by our lockers. He seemed to be kinda out of it. After I unlocked my locker, I pulled out my stuff and set it on the bench. That is when he started to take off his workout clothes. I noticed that there was no towel dance this time, so I was trying to not be obvious as I watched him get naked. When he took off his jock, he stood there naked for a few minutes before he headed to the showers. But while he was standing there, he was starting to get an erection. He did grab a towel and wrap around him, but he never completely closed it. By keeping his towel open slightly, I could see his erection but nobody else could see it. He had an impressive 8" thick dick. The entire time he held the town open, he was watching me as I stared at it. I did get an erection from that, but I kept my jock strap on to hide my erection. I looked up and he was watching me as I stared at him. He looked down and saw my erection in my jockstrap. He closed his towel and turned back around facing his locker. I took my jock off and headed to the showers hoping he would follow. But he never appeared in the shower and by the time I got back to the lockers, he was gone. I decided the next time I saw him that I would be a bit more forward if he repeated the show. But the next time I saw him there, he had moved his locker over a few rows.