Adele Exarchopoulos and Lea Seydoux gave highly acclaimed performances in their film about a lesbian love affair.

Two young actresses, Lea Seydoux and Adele Exarchopoulos, have upended the Cannes Film Festival with their stunning portrayal of lesbian lovers. Their film “Blue Is the Warmest Color” won the prestigious Palme d’Or, the festival’s highest honor.

The film, directed by Abdellatif Kechiche, breaks all kinds of conventions. It runs for more than three hours, which is unheard of outside art houses, and shows graphic sex between the two stars, including a grinding (literally) 12-minute sex scene.

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Typically movies are far shorter and don’t include such graphic sex. But as far as the latter is concerned, that seems to be the trend. Other upcoming movies are heading in the same direction.

The victory surprised many at the festival. Joel and Ethan Coen’s film, “Inside Llewyn Davis,” about a New York folk singer, circa 1961, was considered the favorite. Instead the film won the Grand Prix prize.

Famed Director Steven Spielberg, who is known for his many family films, headed the jury that selected winners. The panel also included Nicole Kidman, who has appeared nude in several films.

“Blue’s” sex scene was a graphic as any porno. The women devoured their naked bodies on screen, showing full frontal nudity. Despite the graphic nature of the film Seydoux and Exarchopoulos were hailed for their performances.

Seydoux is a 17-year-old art student named Emma, who has blue hair She meets fellow student Adèle, played by Exarchopoulos, at school, in what The New York Times called “an emotionally raw and sexually explicit contemporary French drama.”

Adèle, who is 15, is focused on dating boys until she meets Emma, who schools her on sex and desire and helps her transition into adulthood.

In the film, also known as “La Vie d’Adèle,” won over many critics for its ability to transcend its sex scenes and provide a treatise on passionate love.

“You realize the film has won your heart without ever really asking for it, and you leave the cinema utterly lovesick,” wrote Robbie Collin, a critic for London’s Daily Telegraph.

Seydoux, 27, is a veteran French actress and model and comes from a well-to-do family. Her grandfather is Jérôme Seydoux, Chairman of Pathé, and she’s the grand niece of Nicolas Seydoux, Chairman and CEO of Gaumont, according to an unofficial biography.

She’ll next appear in “Grand Central,” a French romance film directed by Rebecca Zlotowski.

Exarchopoulos, 19, has acted in a dozen French films, but Blue is considered her breakout movie. She was also given the Palme as a special prize for her role.