I've met (quite) a few.. spent about 4 years as sales advisor at a lux fashion house, back in the mens formal/business section where all the changing rooms were. And it was the duty of whoever was in that section to monitor and handle customers in the chaining rooms.
So I would always help out with finding the right size or advising on color, tying a tie, then matching the right belt, and - my favorite - getting the pants marked for alterations.
Needless to say, many were hard or semi-hard and some of them would even ask for help with a stuck zipper, yes, on their pants. Again, it was a lux boutique, and rarely if ever we had a malfunctioning zipper.
Less tasteful, but there are proofs of them gettin hard and not needing attention - all the things I'd find in the changing room after a guy would leave in a rush for some reason? Oh boy.