Leonard talks to Sheldon while he's working on "The Table Polarization."
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The Bigi Bang Theory crew crowd around the coffee table for dinner.
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Amy asks Sheldon if they are ever going to have an intimate relationship and then they end up playing private D&D.
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Amy faked her continued illness, so Sheldon would take care of her. He decides to punish her by spanking her. She likes it!
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Amy gets sick and Sheldon takes care of her and that means putting Vaporub on her chest. She likes it!
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Amy dresses up in a Star Trek outfit and plays doctor. Sheldon says he doesn't like it, but tells her to keep at it.
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After a night dancing, Amy kisses Sheldon. It's their first kiss!
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Sheldon and Amy do a scientific evaluation when she gets turned on by Zach. They determine that she's horny. He wants her to go out with Zach, but instead she tries a hand-holding experiment with Sheldon.
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TBBT Quotes

Sheldon: Are you still mad about the sperm bank?
Leonard: No!
Sheldon: Do you want to hear an interesting thing about stairs?
Leonard: Not really.
Sheldon: If the height of a single step is off by as little as two millimeters most people will trip.
Leonard: I don't care—two millimeters?! That doesn't seem right.
Sheldon: No, it's true! I did a series of experiments when I was twelve; my father broke his clavicle.

Penny, there's only one cookie with something in the middle that solves life's problems, and that's an Oreo. Or a Nutter Butter, if you're in a pinch.

Sheldon