The restrooms in our Hunting & Fishing Club were labeled “Pointers” and “Setters”.
At a nearby marina the signs read “Outboards” and “Inboards”.
That one is the most perfectly descriptive of all!
At a bar where motorcyclists hung out the restrooms were labeled "Hardtail" and "Softail".
Today with all this Trans-gender idiocy they might play it safe by having a third door labeled "Convertible".