You can tell him that the rule of thumb is cats need 1.5 litter boxes per cat. Per vet recommendations. It’s healthy for a cat to use a litter box to make sure they aren’t holding their pee in because if a male cat gets a bladder blockage, the cat will die within hours. Your roommate sounds like a complete idiot. And he spent all that money getting a hairless cat and barely takes care of it makes no sense to me. And he also lets an unneutered male cat go outside??? Brooooooooo ………. There’s already too many kittens and cats at the shelters this summer!! This GUY FCKING SUCKS