What's the one place with a set of young closely-knit girls who are probably rather cock-starved?
A college sorority house that's what!
Get a nice campus-style house, fill it with some beautiful women (who've probably never been to college, but you can't have everything), invent some three-letter Greek shit, then get the new 'pledge week' girl in and get her initiated!
It starts with the newbie arriving at the house, where the senior girls interview her about what she could contribute to their sorority's ethos, and their rules. Turns out their ethos is fucking! And with no men allowed in the house, it's lesbian action all the way.
The violation consists of increasingly perverted 'hazing' to prove she's a lesbo through-and-through.
It's a winner, yes?