A guy that frequently presses down on his balls while sitting, iin?

I'll admit I catch myself doing it once in a while too. But I've noticed my buddy do it too. He almost always leaves his hand rest in his lap near his balls when he's sitting and when he gets up or leans his body another way he'll most likely use a hand to press down on his balls. Not roughly squishing them as in CBT or anything, but just applying pressure for some reason. When I've done it occasionally I'd say it does feel a little good, but was wondering do many guys do this and if so why? Seems strange especially to do in public.