I watched a woman pee into a urinal while standing up in the men's room at Mad Myrna's one night. It was at that moment that my understanding of gender differences melted away into a pool of completely comfortable uncertainty. I was never the same again... 
In the immortal words of Meatballs' Tripper, "It just doesn't matter!" 
https://www.youtube.com/watch?v=e9mf3Bypyk8