One of the technology companies (maybe Google?) tried going to an all-gender bathroom -- it was all stalls, no urinals. After a few months half the stalls got labeled "women only" because men prefer to stand to pee and -- let's be honest -- they're not sharp-shooters, if you know what I mean. The women complained that they needed a clean place to sit and pee. So if we want to have universal bathrooms we either need to teach men to sit or we need full-time cleaning crews.