I think any spa someone wants to try a four hand they should consult with Mamasan.
Why? Because who knows better than her the girls that get along best.
We all have co-workers we hate, and those we get along with well, and our bosses know those relationships too.
Who would want to get a 4 hand because he thought this girl and this girl would be good based on looks, only to find a certain catty tension when things get started? Would put a damper on things.
I'd rather not worry about that, lay back, and be like "hey I'm here for the ride Drivers, so please take your time, and be sure we take the scenic route"