If you think Kristen StewArt's work as Joan Jett in The Runaways proved she is much more than just the vampire-loving Bella in Twilight, wait till you get a look at On the Road.

K.Stew isn't the star of director Walter Salles' movie adaption of the Jack Kerouac classic novel about the Beat Generation, but she is anything but a minor player in the flick.

Stewart, 22, plays Marylou, the 16-year-old bride of a writer-wannabe played by Country Strong's Garrett Hedlund, 28. (The two are based on the late Luanne Henderson and Neal Cassady.)

Spoiler warning: You should stop reading now if you don't want to know too many of the movie's details.

Stewart first appears in the film on a bed topless. Then you see her rolling and smoking joints with Hedlund and Sam Riley, who plays the Kerouac-like Sal Paradise.

The sex scenes are numerous. In one, Stewart is sandwiched between Hedlund and Riley. Another has her banging a wall while moaning and groaning.

And then there's the much-talked-about bit where she appears to be sitting naked in the front seat of car and using her hands to pleasure Hedlund and Riley at the same time.

To be fair, Stewart is not the only one who is pushing the envelope in the movie. Hedlund also appears naked (the first shot of him is of his bare bum) and having sex and doing drugs—a lot. He shares a passionate kiss with Tom Sturridge, who plays Carlo Marx (aka poet Allen Ginsberg), and even has a sex scene with—get ready for it!—Boardwalk Empire star Steve Buscemi.

Even so, the sex, drugs and naughtiness are not gratuitous. Like Kerouac's semi-autobiographical novel, On the Road captures both the genius and the recklessness of the Beat Generation.

In other words, this film may not be suitable for Twi-hards of all ages.

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