Interesting question because I bet it's bound to coincide with when the cult dynamics really began to take hold.
Like this isn't your grandpa's swingers group, it is vertical workplace polyamory^1^ with an implicit understanding that if members in good standing don't get sufficient amounts of ass they might get distracted and become inefficient, costing the universe untold billions in unrealized far future lives.
It's very easy to imagine a scenario where they just slapped the polyamory brand on an already established culture of culty sex shenanigans.
- I swear the claudism was unintentional