Howard Wolowitz and Leslie Winkle do the nasty on next week's episode of The Big Bang Theory, "The Cushion Saturation." Really Wolowitz, Leonard's ex? That's not cool, even for you.
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Leonard finally gets the apartment to himself for a date with Leslie Winkle. How will it go?
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When Leonard kicks Sheldon out of his trivia group, be brings in Leslie Winkle to replace him for their team, PMS.
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Leonard asks out Leslie in an attempt to get over his "rejection" by Penny but ends up being turned down by Leslie as well!
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Sara Gilbert stars as Leslie Winkle, a female physicist that works with Leonard and has had an on and off again relationship with him.
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TBBT Quotes

I was expecting applause but I suppose stunned silence is equally appropriate.

Sheldon

Sheldon: Nothing more fun than a paradigm shifting evening of science.
Penny: (to Leonard) And you thought it was soaping me up in the shower.