(Grabs Eric and kisses him more passionately.) (Penny turns and crosses hall.) (Sits with Leslie.) And friends support their friends, apparently. Are you sure things can't work out with you and Leonard? Eric: Hey. Eric: Yeah. Leonard and Leslie are kissing. Leonard: Hey, Leslie. Leonard: Hi. Leonard: How? Leonard: Terrific. Leslie (arriving): Hey, Leonard. Leslie (whispering): That ain't going to make your point. Leslie: I'll leave the details up to you, I think it's better if you assume the male role. Leslie: It's hard to say, I guess there's just a time in every woman's life when she gets tired of waking up on a strange futon with a bunch of people she doesn't know. Out of respect. Penny with a new guy, tres awkward. Penny: Leslie. Penny: They have other things. Sheldon is sitting on the bottom step using his laptop. Sheldon: Everybody has a date. Sheldon: I will graciously overlook the fact that she is an arrogant sub-par scientist, who actually believes loop quantum gravity better unites quantum mechanics with general relativity than does string theory. Sheldon: I'm sorry, I am not going back to the Renaissance Fair. Sheldon: Leonard is upstairs right now with my arch enemy. Sheldon: Leslie Winkle, Penny. Sheldon: Only nine more months to comic-con. So, how many children do you think we should have? The guys enter.
Plan: A: Penny; Q: Who tells Sheldon he is uncomfortable with Leonard dating Leslie? A: her new boyfriend; Q: Who is Eric? A: the Caltech canteen; Q: Where does Leslie Winkle approach Leonard? A: one; Q: How many children did Leonard and Leslie have? A: one-night stands; Q: What type of relationship has Leslie Winkle grown out of? A: their compatibility; Q: What does Leslie Winkle want to determine before they proceed to full sex? A: the "male role; Q: What role does Leonard assume in the relationship? A: Leonard's genetic defects; Q: What does Leslie evaluate during their dates? A: a competitive make-out session; Q: What did Penny and Eric do to make Leonard jealous? A: Leslie helping; Q: How did Leonard make his point during the make-out session? A: Penny's advice; Q: Why does Sheldon accept the relationship with Leslie? A: an argument; Q: What does Sheldon provoke with Leslie? A: loop quantum gravity; Q: What does Leslie support? A: string theory; Q: What theory does Sheldon favor? A: her beliefs; Q: What did Leslie expect Leonard to back? A: Leslie dumps Leonard; Q: What happens when Leonard supports Sheldon? A: Sheldon's relief; Q: What reaction did Sheldon have when Leslie dumps Leonard? A: Comic-Con; Q: What does Sheldon tell Leonard is only nine months away? Summary: After the guys return from a Renaissance fair and see Penny with her new boyfriend Eric, Leonard is approached in the Caltech canteen by Leslie Winkle, who proposes renewing their one-time "relationship". As she has grown out of one-night stands she suggests they take it slowly, first determining their compatibility on all levels before proceeding to full sex (if at all); Leonard can assume the "male role". During their dates, Leslie asks how many children they should have and evaluates Leonard's genetic defects. Penny dumps Eric after unsuccessfully using him to make Leonard jealous (including a competitive make-out session between Penny and Eric and Leonard and Leslie, Leslie helping Leonard make his point). Sheldon tells Penny he is uncomfortable with Leonard dating his arch enemy Leslie, but on Penny's advice he accepts the relationship. Almost immediately, however, Sheldon deliberately provokes an argument with Leslie over the validity of loop quantum gravity, which Leslie supports, and string theory, which Sheldon favors. Leslie expects Leonard to back her beliefs, but when he supports Sheldon, Leslie dumps Leonard, to Sheldon's relief. Sheldon then comforts Leonard with the fact that it's only nine months until Comic-Con.