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"The Skank Reflex Analysis" - Episode 5.01

Fall-out from Raj and Penny's liason

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DVD boxed set of The Big Bang Theory - Season 5

CBS

Plotlines

Following the season 4 finale, Penny and Raj deal with the fallout from their drunken liason. Raj believes that he and Penny are in love. Leonard is depressed, featuring a brief appearance from his mother in a half-hearted attempt to cheer him up. Leonard lets slip that Raj had a crush on Bernadette, which throws a wrench in the relationship between Howard and Raj.

Finally, in a heart-to-heart, Raj reveals to Penny that they never actually completed the act of sex. Still, she begins to think that maybe she has no business trying to be an actress. She decides to leave LA and move back to Nebraska, where she can teach acting ... until she gets word that she's been hired to star in a hemorrhoid commercial.

This Episode's Science

Neurobiology - There's not much physics in this episode, but at one point Amy attempts to explain the neurochemical basis for promiscuity.

Notable Quotes

Amy: When your prefrontal cortex fails to make you happy, promiscuity rewards you with the needed flood of dopamine. We neurobiologists refer to this as the "skank reflex."

Raj: Can I tell people that our love burned too bright and too quickly, kind of a "candle in the wind" deal?
Penny: Sure.
Raj: Can I say it fell apart because you were all "I want to have your babies!" and I was like "I'm too rock-and-roll to be tied down"?
Penny: No.

Sheldon: [Standing with arms out in the middle of a paintball field, sacrificing himself.] Geology isn't a real science!

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