[Sheldon is talking to a potential mate for Penny]
Sheldon
Excuse me. Are you currently involved in a sexual relationship?
Blaine
No?
Sheldon
Would you like to be?
[Leonard and Leslie look shocked and amused as they realise what's happening]
Blaine
Uh... Sure, why not?
Leonard
Sheldon -
Sheldon
[silences him] Can I have your phone number?
Blaine
[looks him up and down] Err... Yeah.
[A little too eagerly, he grabs Sheldon's hand and writes his number on his palm]
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