Inserts (1975) by John Byrum

Inserts is a 1974 British film directed by John Byrum starring Richard Dreyfuss, Jessica Harper, and Veronica Cartwright. It was originally rated X but later re-rated as NC 17. The story concerns a pornographic film production and the film took its name from the double meaning that "insert" both refers to a film technique and to sexual intercourse. The film has a small cult following.