Sexual secrets and drive do turn the tide of our public life. Just ask Arnold Schwarzenegger. Or porn impresario Larry Flynt, author of a new book, One Nation Under Sex: How the Private Lives of Presidents, First Ladies and Their Lovers Changed the Course of American History. This public-private collision turns up as sexual speed traps in the waylaid careers of Schwarzenegger, Newt Gingrich, John Edwards and fully half of the presidents in our history, according to Flynt's book, which he co-wrote with Columbia history Professor David Eisenbach. Lying, blackmail and hypocrisy about secret carnality just add spice to the stew of a particularly American phenomenon described in Flynt's book. One common trait among the powerful and errant, Flynt [commented], "was a huge ego." The book presents us as an often prudish culture where mistresses, illegitimate children and homosexuality in Washington not only dominate the landscape but hijack it at key moments in our history. "I'm the first person to defend a philandering president" who's doing a good job for the public, Flynt says. He'd just like people to know a lot more about sex themselves and care a lot less about how other people practice it. In 2003, Flynt briefly ran for California governor as "the smut peddler who cares." If he had been elected, at least we would have known what we were getting.