Len Lakofka went mental at a thread I had on toilets in dungeons. I say it is realism, others say "Dunna Wanna Know" or "nobody wants to think about toilets in dnd". A dunny is Strayan for toilet or bog house, shit house, crapper, loo etc. Im sure orcs have exciting names for them. I did some tables on them in my redbrick dungeon book. Here is some options for historic lavatories. What do your dungeons have? Where do the monsters empty their chamber pots, or are dungeons a euphemism for open sewer? I like to think magic solves lots of these problems. Nightmen or Gong farmers would gather excrement from cities and sell to farmers, the richer the poop the more the value. Many streets would be ankle deep in shit with seasonal variations. There were times the river through London was a barley moving sewer and the city reeked from miles away. Concentration camps smelled bad. Plus all the animal waste. No wonder slave operated palanquins were so good. I found a real bronze age palace map with on suite large toilet rooms for royalty. If you don't want a fancy sewer use pigs, China thrived on them. A local swamp can help. As long as the rich don't drain it for land then find it actually had a handy function. At least have a chamber pot or a pig sty in every few rooms or a latrine pit. At least in DnD some monsters probably eat the stuff or breed in it. I like giant dungeon dung beetles who roll around huge balls of poop that fill the corridoor and run you down. Everybody poops, except possibly elves.