No, there were no requirements to change underwear. I saw naked first only at university. But with this fetish I can’t change in the locker rooms as I always get bonersMakes perfect sense that you might evolve in your thinking on this crucial topic. Sad that you never saw naked guys during that period. I feel so lucky to have been in school in the 70's when all guys changed from eighty whites into jockstraps for sports. I used to steal the jocks when I could.