I don't have to GAFF about an SWM(S)BO any more, so it's seat up or down depending on need :D
A slight detour: there was a bar in Carteret, Normandy, that I used to go to that had the men's "facilities" behind a plastic strip curtain, adjacent to the bar counter - and women had to go through the same curtained doorway and pass behind any chaps standing there to get to their space.
Noone thought it even slightly odd, but this was in France :)
Further into the more rural regions it wasn't uncommon to find that the dunny was a multi-sex single stall (door optional) with just a hole, a pole to hang onto if necessary. The better class establishments even provided a few scraps of newspaper...