There's a popular restaurant where I live that has a common sink area but separated stalls for men and women. You walk in on the right for women, on the left for men, and then on to the separated stalls.
Here's the funny thing, though - the sink looks like it's backed by a mirror, but it's not - the other side is the men's sink. But not knowing that, the first time I walked in and no one was on the other side of the sink at the time, I wasn't paying attention to the sink, so it wasn't until I was washing my hands that I looked up and realized it wasn't me looking back at me.
It's kind of unique, for the U.S., anyway, at least I haven't seen anything like it before. I don't think it's keeping patrons away, the place is always busy. And now I know what to expect.
Here's a photo (I didn't take it)