En La Cama (aka In Bed) opens to the sound of passionate sex. The camera seems to be under the sheets and that's mostly what we see, though we get a glimpse of a thigh here, a breast there. There's a climax and the camera pulls back to show the couple, lying backs to each other, catching their breath.

Meet Bruno and Daniela, both attractive and probably affluent young Chileans (we learn he's in grad school). They just met for the first time earlier in the evening and bopped off to have a casual one-night stand in a motel room, where they are now and remain for the entire movie. They don't even know each other's names yet and, so, they start to get acquainted.

It all starts out playful. They tease each other. They talk about former lovers. He explains an absurd theory he has about how everyone has one of three personalities defined by what kind of movies one likes. She shows off her appendectomy scar. They smoke. They get horny and make love again.

Then things get more serious. They fight when he accidentally calls her by the name of a former girlfriend. Secrets come out. She cries. More revelations. They peek in each other's wallets while the other is in the bathroom. They try to go to sleep, but end up talking some more. They can't stop looking at each other. As the hours approach dawn, it becomes apparent these two are falling in love, but because of off-screen circumstances, there doesn't appear to be any future they can share. Finally, each of them reveals a secret not only heartbreaking, but unnerving. They fall into a passionate but non-erotic embrace. The end.

I found this movie completely absorbing. But then I'm the kind of filmgoer who seeks out these offbeat gems.

Some reviews suggest the actors, Blanca Lewin as Daniela and Gonzalo Valenzuela as Bruna, spend most of the movie in the nude. Not so. Most of the time he's in boxers and she's in a camisole and panties. Valenzuela does a creditable job as the somewhat hangdog Bruno, but it is Lewin who makes this movie work. She has big, expressive eyes, but it is her full, generous mouth set into a kind of rueful smirk that we are drawn to.

As to the sex, it is erotic, but far from graphic. There's little on view here you wouldn't see in a steamy American thriller. It's about two people who connect on a deep emotional level in one night. Sex is just the calling card.