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Penny: Okay, I have a question.
Sheldon: Yes, Penny?
Penny: You don’t even like people touching you. How are you going to have sex?
Sheldon: Why on Earth would we have sex?
Penny: Oh, honey. Did your mom not have the talk with you? You know, when your private parts started growing?
Sheldon: I’m quite aware of the way humans usually reproduce which is messy, unsanitary, and based on living next to you for three years, involves loud and unnecessary appeals to a deity.
Penny: Oh, God.
Sheldon: Yes, exactly.

4.01 - The Robot Manipulation