The World Is Full of Married Men time, Jacqueline Susann's similarly themed novel "Valley of the Dolls" (1966) had already become a huge bestseller and a hit film, and Collins' novel was accepted. Within a week of its publication, "The World Is Full of Married Men" made the best-seller list. The book was a hit in both the United Kingdom and the U.S., but was banned in Australia. Collins' publishers at the time, W.H. Allen, told her that unless she took the "four-letter words" out, the book would be banned in Australia. Collins proceeded in taking the four-letter words out and it was still banned in Australia.
Jacqueline Susann loathed the film version of "Valley", believed this adaptation was even worse. Susann's third novel, "Once Is Not Enough", was published by Morrow on March 20, 1973. "Once" is the story of January Wayne, daughter of a famous film and stage producer, who is hospitalized in Switzerland for three years. When she returns home to New York City, she finds that the world is far different from the one she had left. January contends with the social upheavals of the late 1960s and early 1970s in a graphic, driving story. Susann was candid about the theme of the book, stating