Mona the Virgin Nymph
Mona the Virgin Nymph (or simply Mona) was the first pornographic film depicting explicit sex to receive wide theatrical release in the United States (1970) [1], following the previous decade's nudist-themed films (called "Beaver films"). The minimal plot involves the titular Mona (played by Fifi Watson), who has promised her mother that she would remain a virgin until her impending marriage.
Mona paved the way for future films featuring explicit hardcore sex to appear in theaters, and was the model on which those films were based; indeed, Deep Throat borrowed elements of its plot two years later. [2]
It was produced by Bill Osco and directed by Michael Benveniste and Howard Ziehm [3], though the film was screened without credits due to legal concerns. The earnings from this film helped finance the directors' later film Flesh Gordon. The team also produced another adult movie, Harlot (1971) and Bill Osco later produced the similarly explicit Alice in Wonderland (1976).