Jon Martello is a handsome guy who his friends nicknamed Don Jon because of his talent at seducing a new girl every weekend. But for him, even the most exciting encounters aren't worth the lonely moments he spends in front of his computer watching pornographic films. Barbara Sugarman is a bright young woman, fed on Hollywood romantic comedies, determined to find her Prince Charming. Their meeting is a shock, an explosion in everyone's life. Full of illusions and received ideas about the opposite sex, Jon and Barbara will have to let go of their fantasies if they want to have a chance to finally live a real relationship ...