Peeing while climbing... make sure you're the top person on the rope?
Seriously though, that would be a challenge.
There's a difference when peeing on the trail. It's one thing for a guy to just find a tree trunk to pee on, but it's different when you have to pull your pants down to your ankles. Due to cancer surgery, my plumbing was rerouted so now I have to basically pee like a girl does. Actually it's more difficult, but psychologically it's different to go now too. I kinda want to be totally hidden instead of just being partially behind a bush.
People will start to think I'm full of s--- digging so many cat holes. Well, they most likely know that I am anyways.