Reply #2: What makes you think they don't? [View All]

[Oreo]

I'm pretty sure they have some kind of "waste disposal system" in their suits.

Here you go.....

http://vesuvius.jsc.nasa.gov/er/seh/suitnasa.html
Suiting up

The EMU comprises the spacesuit assembly, the primary life support system (PLSS), the display and control module, and several other crew items designed for spacewalks and emergency life support. The EMU accommodates a variety of interchangeable systems that interconnect easily and securely in single-handed operation for either normal or emergency use. When preparing to work in space, the astronaut goes into the airlock of the space shuttle orbiter and puts on the following parts of the EMU:

* A urine-collection device that receives and stores urine for transfer later to the orbiter waste management system.

Reminds me of the scene from Dirty Rotten Scoundrels when Steve Martin asks to go to the bathroom