Lolita

Lolita: Wait a sec. You're telling me we're sleeping in one room? With one bed?
Humbert: I've asked them to bring up a cot, which I'll use if you like.
Lolita: You're crazy.
Humbert: Why, my darling?
Lolita: Because, my darrr-ling, when my darrr-ling mother finds out she'll divorce you and strangle me.
Humbert: Lo, listen a moment. For all intents and purposes I am your father and I am responsible for your welfare. We are not rich, so when we travel, we shall be - we shall uh... we shall be thrown together a great deal. And two people who enter into a cohabitation inevitably lead into a kind of...
Lolita: The word is "incest".