Whether your parts are OEM (Original Equipment Manufacturer) or aftermarket, whatever is in your underwear below the navel should dictate the bathroom you use.
We don’t need bathroom laws or bathroom monitors. I don’t care who you’re wearing, be it Oscar de la Renta or Levi’s. I don’t care what you do with your personal life. And you, whoever “you” are on any side of the issue, better damn well respect the rights of others if you want the same respect.