Isn't the whole point of a doll that you impose your imagination on it and play out the fantasies that are in your mind? It's inherent in the nature of dolls. How can Mattel now claim that Barbie somehow comes with restrictions? Or are they saying, do what you want in private, but don't display photographs recording how you chose to play with your dolls?
Go to Flickr and search for the tag "Barbie doll." Are you going to sue all these photographers? I'd link to some that I find especially delightful, but I'm afraid it might upset the photographer, so you'll have to explore over there on your own.
IN THE COMMENTS: Readers recommend other artistic works that use Barbie. And Michael Farris says:
This is fairly insane. Barbie and her friends have been used in sex role playing games by kids since they were invented.Elizabeth says: "My childhood Barbies were oh so lesbian."
What other earthly purpose does Barbie serve if not to fuel kids (half-baked and usually horribly, horribly wrong) ideas about sex?