Larry Flynt is best known for Hustler magazine, which he founded in the mid-1970s, and for the videos and cable TV channels the grew out of the Hustler brand.

But it turns out Larry Flynt was also an amateur student of history.

Ten years ago, fFlynt and a professional historian co-authored a book called "One Nation Under Ssex: How the Private Lives of Presidents, First Ladies, and Their Lovers Change the Course of American History.