Interesting observation. Most of the conversation to this point has centered on taking a leak. As far as stall usage, let me say this. I have to be literally seconds from humiliating myself before I use a public restroom in the sitting position. Sitting down can be avoided in nearly every circumstance... extended dining at a Chinese buffet excepted.
I don't know how women can stand to sit down as a matter of routine. Perhaps they have some sitting tips they can share. Ladies? You out there?