Bernadette: Gosh, Amy I’m sensing a little hostility. Is it maybe because like Sheldon’s work your sex life is also theoretical?
Amy: Well, at least when we do make love Sheldon won’t be thinking about his mother! And yes that’s a cleverly veiled reference to Howard’s lifelong obsession to crawl back into her spacious womb.
Howard: Are you listening to yourself?
Sheldon: I always listen to myself. It's one of the great joys of my life.