Shirley Jones apparently was, and still is, quite the spitfire.

Best known for being in movie musicals like "Oklahoma!" and "The Music Man" and playing the "Partridge Family" matriarch in the 1970s, Jones is about to tell the world she wasn't just an upbeat, smiling TV mom.

Jones, 79, has written "Shirley Jones: A Memoir" (with author Wendy Leigh), which comes out Wednesday. And if the few teasers she shared with the Associated Press are any indication, this may be one of the juiciest reads to come out of Hollywood in years.

The AP story says "a substantial part of the book is spent on her troubled marriage to the late Jack Cassidy, the glossily handsome actor and singer whom she describes in a passage as her first lover and 'sexual Svengali,' and whose lessons she shares candidly."

n this Monday, July 15, 2013 photo, actress Shirley Jones poses for a portrait at her home in Los Angeles. Jones  autobiography,  Shirley Jones,   is being
n this Monday, July 15, 2013 photo, actress Shirley Jones poses for a portrait at her home in Los Angeles. Jones autobiography, Shirley Jones, is being released Tuesday, July 23. (Photo by Chris Pizzello/Invision/AP)

Some of that candid talk centered on Cassidy's, er, manliness, their one-time adventure with another woman in the bedroom (please don't be Florence Henderson), and Cassidy's brief affair with Cole Porter (among other infidelities).

And, reportedly, that's just the start of it.

Jones said, "I never would have written this book if I weren't the age I am now."

She also said that her second husband, comedian Marty Ingels, manages to make her laugh and keep her, well, satisfied.

Contact Tony Hicks at Facebook.com/BayAreaNewsGroup.TonyHicks or Twitter.com/insertfoot.