Season 3, Episode 16: "The Fix-up"

-She didn't stay over? -No. She left.

Listen, you can't mention any of this to Elaine.

Cynthia will kill me. We made a deal.

He was uncomfortable because it was our first time.

So he felt he'd perform better if we did it in the kitchen.

-What? -He says the kitchen...

...is the most sociable room in the house.

And he was serious.