This is a picture from the "massage therapy" place down the street from my place. Notice that in one window, they have three "open" signs (and they have a fourth in the adjacent window which you can sort of see the reflection of).

This "massage therapy" place always has those thick curtains up, so you can never see inside. Additionally, they have a peephole in their opaque wooden door. And usually if you're walking by, and the door opens for a "client", the person opening the door stands behind it so you don't see them. Except for this one time, when I saw an Asian chick with a nightie on.

Anyway, what I don't understand is why a massage parlor feels the need to advertise its openness with such redundancy. I get it: You're open and you provide oily handjobs. You don't need to be so aggressive about it, though.