|Behold...the Space Potty!|
Since you're in zero-gravity, you have to strap yourself down before taking any backdoor action. Also, you're almost certainly going to pee when you poop, so you need a separate hose for that!
Want to learn more? Of course you do! So go to this link for the full training video on going to the bathroom in outer space. (Or check out an article on the topic here.)
Painting by Scott Listfield.