I had a female classmate whose grandmother offered to teach her how to pee standing up. At the time she was little and thought it was gross, so she declined. Later (this would have been in the woods of Quantico, guests of the US Marine Corps and bereft of anything resembling sanitary facilities) she was kicking herself for passing up a perfectly practical learning opportunity.

Nowadays, women deployed in the field have these cute little gadgets that let them whiz against a rock or a tire like the guys do. Gotta love the 21st Century!