The Hamburger Postulate

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

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