Every secret society has some form of sex party or other.
As far as story ideas go, meh. You need to do more than just say people get together to have an orgy and have it mean something to the reader if you want a positive response.
Sadly, my well is dry at the moment otherwise I'd offer a suggestion to how to fix this.
Inara: Well, since I can't seem to find work as companion, I might as well become a petty thief like you!
Inara: I didn't mean petty.
Mal: What did you mean?
Inara: [meekly] Suo-shee?
Mal: That's Chinese for petty.
It never seems clear when sex map interests are when you want to do it to someone else or have it done to you