Leonard: Is my coitus whimsically inventive?
Penny: That is what I write on the bathroom walls. For a whimsically inventive time, call Leonard Hofstadter.
Leonard: I know you're joking, but I'd be okay with that.

Leonard: If I take it off, Sheldon wins.
Penny: Sweetie, every night you don't kill him in his sleep, he wins.

Sheldon: Woman, you are playing with forces beyond your ken.
Penny: Yeah, well your Ken can kiss my Barbie.

Leonard: What am I supposed to do?
Penny: Err, keep your mouth off other women.

Howard: My wife came with both fun bags and money bags.

Sheldon: Penny, all my life I have been uncomfortable with the sort of physical contact that comes easily to others: handshaking, hugging, prostate exams. But I'm working on it, you know? Just recently, I had to put VapoRub on Amy's chest. A year ago, that would have been unthinkable.

Kripke: My work would suffer too if I was getting laid all the time.
Sheldon: Yes, that is the reason. My work is suffering because of all the laid I am getting.
Kripke: You lucky bastard.
Sheldon: What can I say, you know? She enjoys my genitals. I am giving them to her on a nightly basis.