The Sex Monster is a 1999 American comedy film written and directed by Mike Binder, produced by Jack Binder and Scott Stephens, and starring Mariel Hemingway and Mike Binder.

Martin "Marty" Barnes, a businessman (director-writer Mike Binder) who works as a building contractor in Los Angeles, tries to improve his sex life with his wife Laura (Mariel Hemingway) by encouraging her to have a threesome involving another woman.

Though Marty is fortunate enough to find that Laura likes the idea, he is not prepared for her coming to prefer women to men, and seducing other women including Marty's own secretary.

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