Joey: Let me ask you a question. When they were doing it on stage, was it like really hot?
Ross: Oh, yeah.
Joey: Well, okay. So you're fine. Look, the rule is when two actors are actually doing it off-stage then all the sexual tension between them is gone. Okay, so as long as it's hot on stage, you got nothing to worry about. It's when the heat goes away, that is when you're in trouble.
Chandler: Really?
Joey: Look. You guys have been to every play I've been in. Have I ever had chemistry on stage?
Ross: No.
Joey: No!