A group of people wake up, finding themselves kidnapped. They are in a large building, that looks like some sort of bunker (very large). The door to the outside is locked. They have water, power, fresh air, a huge freezer with six months worth of food. There are all accomodations to live. There is also a lot of filming equipment, differently furnished rooms and lots of sex toys, condoms, lube, etc, etc. And a computer terminal that appears to have access to the internet. Although it is ruled by the AI, which censors what they search and post.
And there is a letter. THey have to earn X money (a million?) by making and selling porno, for the door to unlock. Also, if they run out of something, it can be purchased and delivered through one way down shaft, but the money comes from what they earn. They are six (or may be 12) people, men and women, mostly good looking, from different social strata. They are also told, that they will not be looked for.