The Big Bang Theory Season 1 Episode 5 : The Hamburger Postulate
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Summary
While eating at the Cheesecake Factory where Penny works, the guys run into Leslie Winkle (Sara Gilbert) and she suggests that Leonard play in her string quartet as they are in need of a new cellist. Later, after the practice in Leonard and Sheldon's apartment, Leslie offers herself to Leonard and they have sex.
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