My boy scout leader.
He was a bit older, maybe 15-16 years old, and on a calm night during camping he started to talk dirty, stood up in the middle of the tent, lowered his pants and while holding his penis on his hand, said:
"Look how my balls are hairy!"
(Yes, they were quite hairy, and big)
He gets some jokes and comments from other guys, lays down in the middle of the tent, grabs and puts on a condom, covers himself with a blanket and start masturbating. While doing it he said that sometimes he would get out of the bathroom completely sweaty, and when his mother approached him he simply said that the day was hot. After telling this he got quiet, the fapping sound was only broke by his increasing moaning and groaning.
Even not looking, we all knew when he finished...
When I returned home after camping, I tried myself.
PS. Some years later, more than ten actually, I saw him in my polling place. Before I could even greet him, he simply got out of my way as quickly as he could.