"If the actresses is an unmarried virgin, the fatwa adds, then she cannot marry in real life unless her "actor husband" divorces her. This argument was based on another hadith by the Prophet, who once said that Muslims cannot joke (or in this case "act") when it comes to marriage. The hadith says: "There are three [matters] whose seriousness is serious and whose humor is serious: marriage, emancipation [of slaves], and divorce."" (thanks Ziad)