I had a classmate whose grandmother offered to teach her how to pee standing up. She declined, being a little kid at the time but still having an understanding that ladies did NOT pee standing up. Later she regretted not learning the ancient wisdom of the women of her ancestors, but by then her grandmother had passed on.
This was explained to me in the woods of the Marine Corps training center in Quantico, where we were getting our exposure to life in the wilderness running around firing blanks at fellow classmates during our summer of “warfare specialty exposure” as midshipmen. The explanation was after she had disappeared for a brief period of time and returned telling me to not look at her pants under any circumstances.
I understand there are now devices that help with the whole female upright urination experience, although I imagine if you are the type of woman who carries stuff like that in her purse you are probably the type who always uses the loo when available.