We wore jocks under the shorts. Though truth be told, it was a little distracting when we did fitness tests. Kneeling at a classmate's feet holding his ankles while he was on his back with his knees bent and slightly parted doing sit ups you got a pretty good look up his shorts. You couldn't very well not look since you were responsible for watching and counting his reps. Doing bench presses in weight training was the same, having a classmate standing by your head acting as spotter gave you a pretting good show too. Of course by that point you'd probably seen everything he had while dressing out or in the showers at the end of class. By the time we graduated I think I saw all of my male classmates naked multiple times. It was no big deal, okay a couple of them were big deals, stripping off to change and to shower was routine.