Pee & Poop
I have heard tell that the male astronauts had an option as to what size their roll-on cuff was, getting to pick from S/M/L. As the anecdote goes, no one would opt for small (even those for whom it was the right size) and they wound up renaming the sizes. Maybe apocryphal!
https://www.spacecentre.co.uk/collecti...