Season 7, Episode 9: "The Sponge"

Something very strange about this girl.

-She's too good. -Too good?

I mean, she's giving and caring and generally concerned...

...about the welfare of others. I can't be with someone like that.

-I see what you mean. -I admire the hell out of her.

You can't have sex with someone you admire.

-Where is the depravity? -No depravity.

I mean, I look at her. I can't imagine she even has sex.