"The Key" is a 1983 film directed by Tinto Brass, known for its erotic themes and visual style. The story revolves around a married couple, Nina and Giorgio, who explore their sexual desires and fantasies. Their relationship becomes complicated when they invite a younger woman, Marta, into their lives, leading to a series of passionate encounters and emotional turmoil. The film is set in Venice, showcasing the city's picturesque landscapes while delving into themes of love, betrayal, and the complexities of human relationships. "The Key" is notable for its explicit content and has garnered a cult following over the years.