Some of the most sexual explicit content was made by doubles, not by the main actors.
They say "the island" many times but they don't say its name. It is in fact, the tiny island of Formentera.
The movie is divided in two chapters: "Lucía" and "El Sexo" which gives its title to the movie.
Ana Risueño was initially cast as Lucía. Yet Julio Medem later claimed she did not resemble his idea of the character. In her place came Paz Vega, who was seven years younger than Risueño, and performed a disastrous four-hour read-through of the entire script that only confirmed Medem's perversely stubborn belief that she was Lucía because of the appropriate way she had struggled with the character as defined by himself through Lorenzo.
Was shot using CineAlta Hi-Definition 24p. This was the third movie in the world using this format at the time.