Yes, I think there would be interest in something like that. I live in the US, but I assume in the UK there would be a niche for that as well. I tried to find similar places where I lived, but only so far have managed to uncover a few "swingers" clubs. I have had a hard time ever locating any actual dungeons for use. Apparently I'll just have to wait until I have enough money to build one in my own house :-P