- HD 1080
- Runtime: 121m.
- Status: Released
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- Languages: en
- Country: United States of America
- Director: Guy Green
- Stars: Kirk Douglas, Alexis Smith, David Janssen, George Hamilton, Melina Mercouri
- keywords: movie producer
- Production_studio: Aries Productions, Paramount Pictures, Sujac Productions
- Slogan: They fly first-class. They eat in the most elegant restaurants. They make deals that will astound you. They make love that will shock you.
- The Once Is Not Enough is featured in the top rankings of 1975
- #35 in Top Romance Movies of 1975
An over-the-hill movie producer marries a wealthy, spiteful woman and closeted lesbian just to please his spoiled daughter who then, in an attempt to spite him, seduces both a wealthy playboy and a local screenwriter.