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From The Big Bang Theory Wiki

[edit] Summary

Leslie Winkle seduces Leonard but only wants a one night stand. Leonard is fixated on what Penny thinks of it all.

[edit] Critics

"A very enjoyable episode of comedy and character development. It’s always difficult to put a new spin on sex jokes because we have seen a million of them. But Leslie’s dead pan science seduction is funny and Leonard’s character comes out looking sweet. Good job." - The TV Critic's Review