Dotembori is one of the main entertainment districts in Osaka. It's famous for food, noise, drinking, the Kuidaore drumming robot (RIP) and, at one end, just a hint of hentai.
One time the wife and I were after a bite to eat at Kuidaore and took in a bit of a stroll around the area. For those of you who haven't been, it's a lively, vibrant area with any number of drunken revellers stumbling around.
Down at the end is a slightly dodgy end culminating in a small storefront that offers this sign:
If you can't read that it's:
Masturbation room of oncoming generation.
Explain it does not what they are on coming.