Yes it does sound stupid, however I am aware of people who do stand to wipe their ass. Strange but true.
Which do you do, Raven?
I do it while sitting by the way...
And speaking of wiping, another interesting thing about wiping is direction. I've heard that you have to teach girls to wipe front to back to keep any feces away from their hoo-ha's which might cause infection. I never considered that before until a single father friend of mine told me about raising his daughter. That must be awkward pushing backwards rather than pulling forwards. Unless you scooch up on the seat and reach around behind you to wipe. I bet some people do that too.
An infinity of wiping methods abound.