[hota_mazi]

It's easy to test: remove the entire distinction and have only one type of toilets where everybody can go.

Let this experiment run for a few months.

Then compare the number of people who complain about that experiment with the number of people who complain about binary signage.

I'm betting the former number will dwarf the latter. And no, I don't have a citation for that, just giving my opinion.

[greglindahl]

The W hotel in downtown Austin, TX has had all of their restrooms in the bar/restaurant area as single-user facilities labeled Men/Women for... ever since it was built, I think. At least 5 years that I can remember. Among other reasons, it efficiently supports conventions with wildly varying gender ratios.