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.
"Okay, then what's the speed of dark?"
"A day without sunshine is like... night."
"He who laughs last, thinks slowest"
"Depression is merely anger without enthusiasm"
It never seems clear when sex map interests are when you want to do it to someone else or have it done to you