…my character remarked they likely needed to go to the toilet. They insisted otherwise so I let it go, but an hour and seven (I counted) drinks later, they apparently still didn’t need to go. I brought this up in whispers as I felt it was fairly unrealistic and was ruining my immersion, but they disagreed and said it didn’t matter. I was forced to imagine that their character had soiled themselves, which caused them to get quite aggressive OOC.
…but I think a bladder/bowel system based on what you eat and drink (in terms of in-game items), a number of ‘outhouse’ interactable objects in the world (or proper toilets inside buildings) and the need to make sure you use one in time before your character soils themselves could add an extra dimension to things.