|Lessons in love: Professor Collins (John Dullaghan) instructs his students about sex in The Undergraduate.|
Betsy: You've got to be kidding.
Betsy: This is a dirty movie.
Travis: No, no, this is, this is a movie that, uh, a lot of couples come to. All kinds of couples go here.
Betsy: Are you sure about that?
Travis: Sure. I've seen 'em all the time.
-dialogue from Martin Scorsese's Taxi Driver (1976)