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After the guys return from a Renaissance fair and see Penny with her new boyfriend, Eric (Travis Schuldt), Leonard decides to once again pursue a relationship with fellow physicist Leslie Winkle (Sara Gilbert). Thinking that she needs to "slow things down", Leslie agrees to date Leonard, repeatedly assuming the dominant role before conceding that Leonard should assume the "male role". With this new attitude, Leslie goes as far as evaluating Leonard's genetic defects, and talking about procreating children with him. Sheldon explains to Penny that he feels uncomfortable with Leonard dating his arch enemy, who is a "sloppy, arrogant, sub-par scientist". After Penny's advice, Sheldon formally approves the relationship between Leonard and Leslie. However, almost immediately, Leslie and Sheldon start an arg...


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