An upcoming book by Dianne Burnett, ex of "Survivor" producer Mark Burnett, says there was so much sex on the show's set, it should've been called "Camp Lust" or "Infidelity Isle," The Post reports.

"Affairs among crew members were sprouting like mushrooms in a moist cow patch," she writes in "The Road to Reality." She adds, "The unwritten motto was: 'What plays on the island, stays on the island.' "

Dianne was married to Mark for 13 years before their divorce in 2006, and she says she was the "support system," "connector" and "cheerleader" who came up with the title "Survivor."

She details in the book - out Sept. 18 from Agape Media, and subtitled, "Voted Off the Island! My Journey as a Real-Life Survivor" - how Burnett swept her off her feet and they started a family while traveling the world.

But, the show's "popularity was a double-edged sword." By the second season in Australia, she