gotta' relieve themselves and noplace to go?
I am serious, 'cause l really do not know.Do they use astronaut diapers or something?

As my Daddy always said, ''You shoulda thought of that before we left the house''. And he was purty smart.

No astronaut diapers r needed. Wow.can u imagine climbing for several more hours wallowing in ur crapulence?

Wayne is tips for pottying when climbing:

1. Go before u go.even if u have to force it.
2. Hold it.
3. IF u really have to go AND you're literally hanging from a rope, u can rig something up so that u can drop tro' & poo or pee (as required). Places like Yosemite require the use of a ''poop tube'' (longish, wide piece of PVC pipe) to hold ur poop as u big wall climb).
4. If the temperatures r -30 F, go VERY quickly.

no.
there isnt a special method:P.

if you need to go then its be uncomfortable in the limited clothes you have for days or lose some dignity. think of it as a really long long drop :L. just hope you dont get dihorrea

read 'clouds on both side' by julie tullis if you want some more details lol.

Or a foley catheter?

well there is a clip on the back of your harness that loosely attaches your leg loops to your waist loop, this can be unclipped. the main reason for this being a feature is so that you can drop trow a little more easily and evacuate your bowels..
i find though that when you're properly in the middle of an epic climb, the last thing on your mind is needing to poop..

um pee ice cubes?

most everyone else has much better , l am just getting my 2 points!