I tend to wear short tights under my shorts or a jockstrap... otherwise my bits start sliding out from my pants. Don't like commando in the gym or yoga studio, especially when I'm teaching. Not always good for the students to see me in that light! LOL

Besides, I bulge enough without having to have my cock drop out during a workout to make an impression, and the jockstraps and tights make my ass look very very nice too!