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Episode Details

The Big Bang Theory is back! On the premiere, the gang deals with Penny and Raj actually sleeping together.

Rating: 4.2 / 5.0 (90 Votes)
Episode Number:

The Big Bang Theory Season 5 Episode 1 Quotes

You can't ruin a friendship with sex that's like trying to ruin ice cream with chocolate sprinkles.


You can't blame yourself. 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.