Zooey, you are suggesting a fantasy world. We, here, will all be long dead before something like this would happen, BUT... let's pretend this was a thing that was real. By the time the pee police show up, everyone is long gone. It's simply impractical. Unisex restrooms will happen long before "Pee IDs."
THIS!!!!
No question you would know from stupid. And you are demonstrating yours profoundly. Just FYI, if cross dressing is a fetish for you fine. It is not for most.