Real sex in a real movie?

Here's an interesting story about a director who is trying to make a "real" movie with real sex in it. He's screwed if he thinks it won't get classified as porn anyway. Even though porn is legally classified by the intent to arouse than by the explicitness of the sex, at least in theory, most of us are too dumb to get the difference.

After all, I saw Pink Flamingos in the porn section at a video store once. I guess the thinking on that decision was that since there's a lot of nudity and actual sexual contact in the film, that makes it a porn. I hope that no unfortunate soul ever accidentally rented it with the hope of getting off to it. Or if anyone ever has, that he managed to enjoy the movie anyway.

Still, I don't think it's just prudishness that has kept explicit sex out of the movies. The ugly fact of the matter is that real sex doesn't look as good as fake sex, what with the funny faces and awkward movement and all.