Hmmm, I prefer to use my own loo or at least a non-public one, but won't *not* go if the need arises. But that could come from having grown up working on a farm where the loo was a heck of a long way away and you couldn't just down tools and go - the trick was to time it so the workman on the other tractor in the paddock was on the other side of yours so they couldn't see you - or it'd be all over the 2-way.
About the only up-tight thing I have is seating arrangements in public spaces (restaurants etc) - I have to have a wall at my back or something solid. Some kind of paranoid clowns are trying to sneak up on me thing :)

