Is it correct that there is only one bathroom on the Enterprise? You never see them in anyone's quarters. Personally I would just crap into my food replicator and have it convert my poop into energy, that's probably what their actual toilets do anyway.
hahaha pwnd! I'll bet you totally remember seeing a girl's boobs in high school too but that of course is another of your false memories along with all those toilets you were so sure were in every interior shot of Star Trek
It's established in the first few episode that the food they eat is 100% efficiently converted into energy and there is no waste product any more. There are showers in everyone's living quarters, but they don't use water, they use compressed air.
although to your credit, a lot of crew members die and not one shits them self on the way out