Wait wait wait

So it's a portable bathroom device? In the shape of a milk carton? So I get it, girls couldn't use it. But why would they? Women's restrooms in Japan are just tiled holes in the ground. My real question is, if it's shaped like a milk carton, does it also have missing persons on the side? Like a Japanese guy with a word bubble that says "missing, my ability to pee on a tree or in a hole like the girls".