this isn't really a 'physical', but still interesting medical experience.....
Several years ago I'm at one of those 'health fairs' where I'm having my blood drawn ($35 for a panel that costs over $400 at my dr), the line is really long so I walk around a bit and notice they have prostate/testicular exams for men. I haven't had prostate done in several years and testicular since college, so I think what the hell the line wasn't too long. You go in two at a time to a prep room where they ask you to remove your pants and wait in your underwear, there are already two men in there ahead of you and when two have seen the dr they call in two more, assembly line style to save time. I've taken off my shoes and have opened my trousers to strip them off when I realize I'm going commando (I rarely wear underwear so never think about it) ........... I hesitate and look around noticing that the first guy in line is standing there with no underwear balls-out holding his pants and shoes (while guy #2 is standing is his tightie whities)waiting to go in and see the dr. He must have noticed my expression and was sympathetic because he says "yea, I don't wear underwear so what are you gonna do?" and chuckles. Well I just said, "neither am I so I guess it is ok" and stripped off my pants also since the other two seemed ok about it. I've never been cock-shy around other men. So here are 4 men (two in underwear and two balls-out) just chatting like in a lockerroom when the attendant comes to get the first guy for the doctor, he sees me and says "oh, sorry I should have told you it was ok to keep your pants on if you were uncomfortable" -- clearly I wasn't, LOL.
So when its my turn for the doctor he says, "looks like you're ready for this" making light of my lack of underwear. He does the prostate exam first and as he's reading my form and asking typical questions I hear him changing his gloves and he says, "since you're hanging nice and low I'm going to start the testicluar exam from here if that is all right" and starts cupping my balls from behind all the while asking questions about my nut size, have I always hung lower on right, etc. By the time he asked me to turn around, between poking around on my prostate and feeling me up while bent over, I was sporting a thick hanging chubby and a bit embarassed as he handed me my cock and said, "I'll ask you to hold this". He finished up real professional, but it was just a little different than I'd ever experienced. Maybe it was just the 'assembly line' type of exam and how they do it en masse?
One funny thing is I went back the next year and they were only doing two men at a time in the prep room, and the following year it was one at a time so I guess someone was uncomfortable about the undressing procedure.