Dear persons with vaginas,
Why in the world have you not yet learned to pee standing up?
I've seen demos of this. My understanding is that with proper technique, and without props, you can do it without pissing all over your pants and without getting your hands or legs wet.
If I found myself in some kind of Freaky Friday body-swap situation, figuring this out would be first on my list. Ok, second on my list. Ok, third on my list. Ok, definitely some time during the first week.