Mal: She’s a nice girl.

Book: Seems very anxious to please you.

Mal: Well, that’s their way, I guess.

Book: I suppose so… If you take sexual advantage of her, you’re going to burn in a very special level of hell. A level they reserve for child molesters and people who talk at the theater.

Mal: What — I am not… preacher, you got a smutty mind!

Book: Perhaps I spoke out of turn.

Mal: You may perhaps I’m thinking!

Book: I apologize. I’ll make her up a room in the passenger dorm.

Mal: Good.

(Book leaves, then pops his head back in a moment later.)

Book: The special hell.

Firefly — Episode 6 — “Our Mrs. Reynolds”