Got this idea from a comic once. A haunted brothel that appears in random places and full of nice ghost sluts. They let anyone have their way with them for free. They let them literally do anything (even stuff that can be fatal to the living) since their ghosts. What the ghost get in return is the patron's energy from their orgasms which is harmless to the living.
Interesting idea. Do the patrons know they're ghosts? Also sexy and ghosts usually dont mix well, unless sometimes when it involves controlling the actions of the living.
That depends what kind of ghosts they are. "See through and non-physical" wouldn't work obviously but that's not the only type of ghost that exists in myths. They could be seemingly real (and touchable) when they want to be, such things are part of the Finnish ghost stories of old for example. The ghostly powers and appearance can show up after the meeting has been going on for a while. Like, patron is having sex with the prostitute and suddenly realizes that they are floating over the bed and when she orgasms she turns ghastly pale and screams like a banshee. Literally, like a banshee.
Lol, i can imagine it would be hard for the patrons to keep it up after that, not to mention the reputation a place like that would have, or complications of a teleporting building. Do you plan on writing this story, or is it just an idea? Not to derail anything but maybe a vampire brothel would be easier. Not saying ghosts couldnt be done. Maybe they could haunt the patrons when they leave, i dont think sexual poltergeists have been too overdone.