Quote from Phoebe in The One with Joey's Award
Phoebe: Oh, my God. That guy at the counter's totally checking you out. Monica: Really? Oh, my God, he's really cute. Phoebe: Go for it. Monica: Phoebe, I'm engaged. Phoebe: I'm just saying, get his number, just in case. But if Chandler's in an accident and can't perform sexually then he would want you to take a lover to satisfy the needs that he can no longer fulfill.