An upcoming book on the life of Hugh Hefner offers the sordid details of some of Hef’s more interesting sexual experiences including a foursome with his brother and sister-in-law, as well as a homosexual encounter in downtown Chicago.

As reported in The New York Post, Mr. Playboy: Hugh Hefner and the American Dream, author Steven Watts writes that Hefner and his first wife Millie shared an encounter with Hugh’s brother Keith and his wife Rae. Though the book points out the Millie did not end up having sex with Keith, Hef ultimately did wind up having sex with his sister-in-law.

Another passage from the book states– “Hefner’s thirst for sexual experiences became so strong that he even had a one-time homosexual experience. One evening in downtown Chicago he was propositioned and, according to Hef’s friend and Playboy co-founder Eldon Sellers, he ‘thought, what the hell. Found it an interesting experience. As far as I know, the guy just gave him [oral sex].’ “

The book also tells the story of Hef shooting a porn movie of himself and a female lover, who performed for the camera in masks.

On the validity of these and other stories reported in the book, Hefner told The New York Post– “This is the most authoritative book ever written about me . . . It’s all essentially true.”