All of the Euro versions I remember seeing were essentially just basins - no special wand or hose or jets; you just fill it up and scrub with your hands. Then dry with the ass towel.
that seems grosser than just using paper.
shared asstowel? what?
and you have to get shitty water on your hands?
those ones like pictured which seem more like a doggy drinking fountain, I thought may've been more for like shaving your pubes or something handy like that, because a little gravity flow of water like that doesn't seem like it would be as useful as a jet, especially since, as you suggest, you pretty much have to get your hands dirty this way