Over at Slate, Ian Ayres argues that single-use toilets should never be gender-marked. (Linguistic aside: I always assumed Americans used “toilet” to refer specifically to the bowl, not the room - this is a rare instance of the latter referent.)
This makes perfect sense to me: I understand why toilets with cubicles and (in the men’s room) urinals might need to be labeled “male” or “female”, but it seems very inefficient to label the single-use ones - we don’t do so for handicapped stalls, and, as Ayres points out, airlines don’t do it. And doing away with labels prevents the ludicrous situation of women queueing up for the women’s loo while the men’s one goes blissfully unoccupied. So preventing the possibility of preventing transgendered people from being beaten up leads to efficiency gains (though, strictly speaking, not strongly Pareto optimal as this might increase the waiting time for men) - sounds good to me. Perhaps the World Toilet Organisation should be informed.