They are rarely seen eating, and I’ve never shown them going to the bathroom. Do you think that they just never shit? Of course not. It’s just naturally assumed that some everyday stuff goes on around whatever is shown in the comic. Same thing with a baby (Yes, I’m comparing parenting to shitting. Can you tell I’m not a Dad?).
Oddly enough, I just kind of assumed they didn’t do those mundane things because, you know, they’re comic characters =p
I kid because I love.