Maybe they also serve adult food there?

The sign below seems to prove your idea of being deliberate beyond any reasonable doubt... After all, neither you nor I can verify the meaning of whatever they write in the original language...

I often go to a sushi place across the street. The sushi is quite good. By the way their first sushi master was Russian... Anyway, there are some hieroglyphs on the walls there... I could only wonder what they're saying...