Jackie O seduced Marlon Brando -- and he wanted to reveal the steamy details of their romp, a new book claims.
The alleged post-JFK assassination affair is detailed in "Bobby and Jackie: A Love Story" in which author C. David Heymann reprints what he bills as unpublished excerpts from Brando's memoir that discuss his two steamy encounters with the first lady in 1964, the New York Post reported.
The book also claims for the third time that Onassis had a tryst with Robert F. Kennedy, an allegation shot down by fellow Kennedy biographers.
Brando's account of the affair was detailed in passages from the first draft of his 1994 memoir "Songs My Mother Taught Me" -- but an editor at Random House who was friends with the first lady cut the accounts out of the book, according to Heymann.
He said Jackie had "boyish hips" and a "muscular frame" when they hooked up at a Sutton Place pad on loan from his friend.
"I'm not sure she knew what she was doing sexually but she did it well," Brando reportedly said.
Their first encounter, "according to Brando, [their] three-hour meal included a good deal of drinking. ... Jackie and the actor danced and drank. During their dance, Jackie, deeply attracted to Brando, 'pressed her thighs' suggestively into his. They danced again, then sat down and began to 'make out,'" Heymann writes.
"In Brando's words, 'From all I'd read and heard about her, Jacqueline Kennedy seemed coquettish and sensual but not particularly sexual. If anything I pictured her as more voyeur than player. But that wasn't the case. She kept waiting for me to try to get her into bed. When I failed to make a move, she took matters into her own hands and popped the magic question. 'Would you like to spend the night? And I said, 'I thought you'd never ask.'"
The book also alleges Jackie O had a tryst with in-law Robert F. Kennedy. The pair was openly affectionate during Christmas vacation in Palm Beach when friend Chuck Spalding said "you would have to be dumb, deaf and blind not to see it," the New York Daily News reported.
Many critics are ripping Heymann for making the allegation that Jackie O and Bobby had a fling based on weak evidence.
"It's a new low, and you just wonder how far people are willing to go," Laurence Leamer, author of "The Kennedy Men," "The Kennedy Women," and "Sons of Camelot" told the paper. "[Heymann] is just trying to make a buck. Yes, Bobby and Jackie had a relationship as friends, but [the romance] is a total exaggeration. I feel sorry for Heymann."
The book is due out next month.