I'm a good girl.
I went to Catholic school.
The Big Bang Theory Season 4, Episode 22
...and I quote, she'd like to see
"the little Catholic girl first."
The Big Bang Theory Season 4, Episode 23
I'm having sex with a Catholic
schoolgirl tonight.
The Big Bang Theory Season 7, Episode 21
Brought a Catholic girl home
to your mother?
The Big Bang Theory Season 4, Episode 23