There's a divide among today's movie watchers; for some, a sex scene can ruin, or at least cheapen, an otherwise great movie. But for others — those who are correct, I daresay — sex scenes are as necessary as any other element of realistic storytelling because sex is a part of life. That's not to say that every movie should contain a sex scene, of course. But when it makes sense, it makes sense. The viewing experience of an otherwise terrible movie can, in fact, be rescued by a really great sex scene or two. Passion, tension, chemistry — what's more watchable? Below, 40 of the best sex scenes from movies.