It's a website to help find gender neutral restrooms, something rather useful for the gender variant who don't feel like being harassed for not looking like whatever the sex field on their drivers license says. (Also this could be useful if a parent needs to help an opposite gendered child above some age.) ((I just think I know more gender variant people than parents)).
Unsurprisingly they have the most data for San Fransisco but Portland, Seattle, Boston and Cambridge all seem to stand out of their tag cloud.
I wish more restrooms weren't gendered. One common assumptions is that one gender is "cleaner" than the other. But I don't think that's true. It seems like women's restrooms are actually more likely to have pee on the seat cover than mens rooms while mens restrooms smell a bit stronger. (Both dirty, just differently).
As far as I can remember the biggest difference between mens and womens restrooms is the nature of the graffiti.