Other than the simple gross out factor, the long term problem with having these things is that as a society many young people already feel isolated and some are dealing with social anxiety or may spend too much time on the internet or work may leave little time to meet people.
It's bad enough to go to a bar for social interaction but what about going somewhere to have sex with a machine? A rented machine at that? How gross is that? Who is going to clean it up in be tween rentals (what a job to have) and really, who wants to stick their junk where someone else was just minutes before? The whole thing makes me sick to my stomach.
There's two planes of thinking to it. One, the dehumanization of it all. Having robots who look like women and who are rented like a power washer or back hoe is disgusting. It's a moral issue. And two, people who think one can do anything they want is ok as long as they aren't hurting anyone. But clearly this affects the area, the other businesses and environment, so there's that.