No idea's original, but nobody seems to mind. Mila Kunis and Justin Timberlake proved that with "Friends With Benefits."
The movie sold $18.5 million in tickets to come in at #3 at the box office this past weekend, behind "Harry Potter" and "Captain America." This, despite the fact that a very similar movie, "No Strings Attached," was released this past winter.
On the bright side, we keep getting to see new pictures of Mila Kunis. So there's that.