[niftich]

I highly doubt this, since genitals only really determine if you can use urinals effectively, and non-urinal toilets are also found in the same bathroom as one that has a urinal, as they're needed for other stuff. Therefore, there is no need to legislate genital-to-bathroom mapping (regardless of your political and/or social beliefs) as the capabilities of your body will sort it out.

On the other hand I can better understand the argument that people's appearance causes us to make certain assumptions about whether they are of a particular gender, which causes us to make certain assumptions about their sex, and that presence of the opposite binary sex in bathrooms has been historically considered taboo, or unwelcome, or creepy, or [insert visceral reaction here]. This is real meat of the debate, because it pits people's self-identification against others' profiling, and one group of people's right to privacy to a different group of people's right to privacy.