Porn king Larry Flynt visited 'Piers Morgan Tonight' (weekdays, 9PM ET on CNN) to promote his book 'One Nation Under Sex: How the Private Lives of Presidents, First Ladies, and Their Lovers Changed the Course of American History.' As the title makes apparent, the book explores the sex lives of our founding fathers and presidents.

"Who was the most sexually promiscuous president?" Morgan wondered. Flynt replied, "It's a toss-up between William Harding and John Kennedy."

Flynt then agreed with Morgan that Kennedy's personal extra-curricular activities would have been eventually exposed and "discredited" his presidency if Kennedy hadn't been assassinated.

Marylin Monroe, Marlene Dietrich and Angie Dickinson were among the starlets that Flynt linked to Kennedy.

And somewhere Bill Clinton is marveling at how much JFK was able to accomplish in less than three years.