So i'm a junior in high school and in gym class we started our swim unit. Usually i barely have to change for gym class, just swap out shirts and pants in the locker room for something athletic, but for this everyone in the locker room gets naked to change into swim trunks. And, i have to swim shirtless in front of the whole class. The shirtless part i am fine with because i have been working out lately and although there are not fit boys in the class, i am proud of my abs and the rest of my body. However in the locker room today my friend saw another friend's penis and wanted to see how we all compared, so all of us guys got hard and compared our boners. My 6 inch penis composed well to most of the class, although some guys had me beat too. One friend of mine has a 9 incher! Nothing sexual happened, we took cold showers to cool down, but had anything like this happened to you
That's the way it was when we were all required to be dressing together as part of school of organized sports. But smaller groups of boys would gather informally for sex-play. Erections, masturbating and really close comparisons of penises and their functions were not uncommon in these gatherings. They just needed privacy. This would come to an end when the individual "boys" figured how to get "girls" to join them in their sex-play.