@freemo @bonifartius @Vivernu Actually I think that the most secure sorts of facilities are secure small stalls arranged along a very open public hallway. No danger of going inside only later to find someone lurking there. Also in public venues this solves the problem of women having to spend much more time in waiting lines than men. Or having to have a separate unisex or family facility for those needing someone to accompany them. Gender is no longer an issue.

Many decades ago, I worked in an industrial facility where my chemistry lab was located in the tanks and piping lower level of the facility. They failed to anticipate that a woman would ever be there. The company simply secured the toilets and showers of the formally male facility. I had no issues sharing this with other workers. It even became known to upstairs workers as a comfortably gender neutral place. It did occasionally blow the minds of a few unsuspecting outside contractors though.