Match Point

To begin with, you should all watch Match Point if you haven't already. It's quite interesting.

In any case, there is a scene where Nola (Scarlett Johansson) is discussing with Chris (Jonathan Rhys Meyers) the differences between herself and her sister, where Nola describes her sister as "beautiful," but herself as "sexy." Chris disagrees, and Nola elaborates on what she means:

Nola: You should see my sister, she's…she's very beautiful.…

Chris: I'm sure she's not more beautiful than you are.

Nola: What I am is sexy. But…my sister, is classically beautiful.

Chris: So you are aware of your effect on men?
…
Nola: Men always seem to wonder. They think I'd be something very special.

Chris: And are you?

Nola: Well, no one's ever asked for their money back. [note: she's joking here, she's not really a prostitute.]