Quote from Chandler in The One with Joey's Fridge
Ross: Okay, she can't go. Phoebe: Ross, you can't tell her not to go. You just started dating. Ross: Then what am I supposed to do? Phoebe: Nothing. You just have to be cool with it. Ross: Well, what if she goes down there and then sleeps with a bunch of guys? Chandler: Well, maybe you don't marry this one.