Warren G. Harding (1921-23)
[Harding] spent his time in office conducting random adulterous affairs, including a 15-year relationship with Mrs. Carrie Phillips, the wife of a friend. He began an affair with a 17-year-old, Nan Britton, when he was 53, passing her off in public as his niece. When she gave birth to his daughter, Harding tried to buy her silence by paying her $20,000 plus a monthly allowance. It didn't stop her from cashing in with a best-selling kiss-and-tell book, published in 1927, that detailed clandestine trysts in seedy hotels, in the Senate Office building, and once, memorably, in an Oval Office cupboard.
In the mood for more sordid details of past presidents that make Clinton's shenanigans look as boring as C-SPAN? Click here