I made a thread like this a long while ago with a setting called [The Community] which involved a secure facility where hedonism and dominance were valued. There were essentially four castes, determined initially by an "interview" that started with a session of groping. People on the submissive end of the system are essentially detained inside the facility, unable to leave unless they're somehow able to climb rank and be seen as trustworthy enough to keep secret what happens inside.
Dragons were the highest class, made of people who show strong dominant tendencies. It's rare for someone to be given the rank from the interview, most rise to this status through proving their ability to dominate and manipulate over time.
Devils are the "weaker" level of dominants. For the most part they're on the same level as dragons, but in disagreements between a devil and dragon it's understood that the dragon will typically have their way in the end.
Sluts Are submissives that are easy to control and lead, and are at least accept the practice of frequent casual sex. They're given some autonomy, and unless they're personally adopted and given their own quarters, they're left to freely roam the [Meeting hall].
Slaves Are the lowest tier. They refuse to participate in the fornication, or otherwise reject the culture of [The community]. They're restrained in the [Meeting hall] to helplessly wait for someone to use them. If they start to submit willingly, they may climb to the rank of slut, but otherwise they're treated like objects for D rank persons to use and abuse to their liking.
Sealed Dragons Were an idea I had, but never mentioned. Essentially anyone who would be dangerous to [The Community] fell into this class. Examples are people who would betray the oath of secrecy, or someone who was extremely difficult to detain during the "interview."
The idea was basically the orgy room, but more firmly rooted in a fleshed out BDSM setting and also sort of being a starting point for possibly long-term RP.