Evidently it's true! Hugh Hefner is so addicted to sex that he once had a sexual experience with another man.

In his upcoming book, "Mr. Playboy: Hugh Hefner and the American Dream," Steven Watts writes:

"Hefner's thirst for sexual experience became so strong that he even had a one-time homosexual experience," Watts writes. "One evening in downtown Chicago he was propositioned and, according to Sellers, he 'thought, what the hell. Found it an interesting experience. As far as I know, the guy just gave him [oral sex].' "

And Hefner has evidently said this book is basically true.

"This is the most authoritative book ever written about me... It's all essentially true," Hugh said.

Wowza! Talk about a Playboy!