Quote from Chandler in The One with Princess Consuela
Mike: Thank you guys for having us over. Phoebe: Oh, yeah. This is fun, couple's night. Chandler: Yeah. I don't know why we don't hang out with married couples more often. Monica: Well, because every time we do, you make jokes about swinging and scare them away. Chandler: You mean that Portuguese couple? Yeah, like you wouldn't have done it.