(Walks away smiling). But who cares what Penny thinks, Lesley is a terrific girl, she's attractive, we like each other, she's extremely intelligent. Howard: And walks in quiet beauty like the night. Leonard: If Penny didn't know that Lesley had already turned me down then that would unambiguously mean that she, Penny, thought that I should her, Lesley, out, indicating that she, Penny, had no interest in me asking her, Penny, out. Leonard: Just extending the intimacy. Leonard: Make it two. Leonard: Regardless, I have a chance at a real relationship with Lesley, I'm not going to pass that up for some hypothetical future happiness with a woman who may or may not want me to be happy with a woman who is currently making me happy. Leonard: Thank you, I'll see you at work. Leonard: You want to make plans for New Years. Lesley: He switched over to high energy radiation research, had a little mishap, and now the other guys are uncomfortable sitting next to him. Scene: The Cheesecake Factory. Scene: The apartment living room. Sheldon: He asked her out once, it was an embarrassing failure. Sheldon: So you're saying Leonard has a girl in there. Thanks for a great night. The string quartet are practising.
Plan: A: The guys; Q: Who is eating at the Cheesecake Factory when Leslie Winkle approaches them? A: work; Q: Where did the cellist get irradiated? A: Leslie Winkle; Q: Who wants Leonard to play cello in her string quartet? A: the current cellist; Q: Who is Leonard uncomfortable playing with? A: the quartet practise; Q: What event in Leonard and Sheldon's apartment leads to Leslie seducing Leonard? A: Sheldon; Q: Who is uneasy about Leonard's relationship with Leslie? A: Penny's advice; Q: What does Sheldon ask for after Leslie seduces him? A: Penny later congratulates Leonard; Q: What does Penny do after Leonard and Leslie have a one night stand? A: a real relationship; Q: What does Leonard decide to pursue with Leslie? A: an imaginary one; Q: What relationship did Leonard pursue with Penny? A: her sex drive; Q: What did Leslie need Leonard to satisfy? A: New Year; Q: When does Leslie's sex drive end? Summary: The guys, eating at the Cheesecake Factory where Penny works, are approached by Leslie Winkle. She wants Leonard to play cello in her string quartet as the other players are uncomfortable near the current cellist who was possibly irradiated at work. After the quartet practise in Leonard and Sheldon's apartment, Leslie seduces Leonard for the night, making Sheldon so uneasy that he repeatedly asks Penny's advice. Penny later congratulates Leonard, who tries to figure out what she meant. Leonard decides to pursue a real relationship with Leslie rather than an imaginary one with Penny, but at her lab, Leslie makes it clear she is not interested in a relationship: she just needed him for a one-night stand to satisfy her sex drive - which is now satisfied until New Year. Leonard later tells Penny, who reassures him and walks away smiling.