Participating in a sports event (baseball, soccer, football) with a group of hot masculine men, especially one that includes body contact, will always result it very hard erections straining by jock. In the name of discretion (and because most of the other guys are straight) I found a good cup would both hide by erection and give me a great deal of sexual stimulation and pleasure on the playing field. In the cup my dick just takes charge and it'll unload when it wants to, no matter what I'm doing. A very nice sensation. Of course my cum filled up just adds more stimulating lubrication which'll keep my hard (and often get me off a second time during a game) for the afternoon. Most of the guys I play with are used to my constant hard on, and it doesn't bother me if they joke about in the locker room, so after the game I peel off my jock wrap my cup in a towel and hit the showers, my dick pointing straight up. If I get some privacy I'll bring myself off and that'll get my dick relaxed again, but as much as I love to jack off with and for other guys, doing it with my team mates would be pushing it too far, they're good sports about my hard ons, I'm thankful for that.