[Sheldon has joined Penny, Bernadette and Amy Farrah Fowler on their girls night out at a bar]
Penny: Sheldon, have you ever kissed a girl?
Sheldon: Other than my mother, my sister and my mee-maw, no. But in the interest of full disclosure, I was once on a bus and had to give mouth-to-mouth to an elderly nun who passed out from heat exhaustion. Every year I get a Christmas card from her, signed with far too many X's and O's.
Bernadette: That doesn't count! Aren't you even a little curious?
Penny: Yeah, you're a scientist, where is the curiosity?
Amy: I'm available for experimentation [turns towards Sheldon and puckers up]
Sheldon: Thank you, but not necessary. We know everything there is to know about kissing. It requires 34 facial muscles and 112 postural muscles
Amy: Oh blah blah blah. Give me some sugar, bestie. [turns to Penny and kisses her, all three girls start giggling]
Sheldon: I'm certainly glad no one said they were curious about Aztec human sacrifice.

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