Quote from Phoebe in The One with the Ballroom Dancing
Phoebe: Somebody tell me I don't have to work today. Monica: Why, what's the matter? Phoebe: My first massage is this incredibly gorgeous guy. Every time I see him, I want to do things to him I can't charge for. Monica: So do them for free. Phoebe: Oh, no. It is forbidden. Mrs. Potter fires people for messing around with clients. And it's against my oath as a masseuse. Ross: They make you take an oath? Phoebe: No, I made myself take one. Yeah, no fooling around with clients and always be prepared. That one's actually from the Boy Scouts, but it just makes good sense.