An image for you from North Carolina. It looks like the building was designed to standard building codes, but as there was very rarely a female in the building, the guys were using whichever washroom was available, so someone made it official. The washroom door locks and inside is a toilet and a washbasin with shaving cream and other toiletries indicating that people practically live in this building. I have no problem with using a unisex head. I'm often surprised to find that a maintenance hangar or other mostly male province has a ladies room.