My good wife (an avid outdoors woman) theorizes that part of the curses laid down in the Garden (but left out of the good book for reasons of propriety) was one which ordained that women, for ever more, would have to squat for # 1.
I, on the other hand maintain that, with diligent practice, women would be able to overcome this curse! ;o)
Two words: Kegel Exercises. Women CAN stand up to pee once those muscles are in tip-top form, ;)