Pissing is actually an entirely redundant function, people with vasectomies or transfems post bottom surgery simply do not need to pee anymore, just like about 90% of all AFAB individuals (most of whom aren't aware of this due to an enormous disinfo campaign - the "girls don't pee" meme is part of this psyop, a reverse-psychology attempt to gaslight women and girls into using the bathroom). It would be a trivial task to free all of humanity from the piss burden, or give them the option to only piss for fun, if they feel like it, but Big Toilet and the drinking water mafia do not want you to find out the truth.