The key question that a book called "Sex With Presidents" needs to answer is: Whose was biggest? As in: Which president's sexual exploit-filled chapter is the biggest?
The book about our skirtchasers-in-chief has a surprising answer: Franklin Delano Roosevelt has 34 pages devoted to his extracurricular activities, although there's an asterisk since his chapter, "Franklin Delano Roosevelt and the Good-looking Ladies," also spends considerable time on the affairs of First Lady Eleanor Roosevelt.
So it's probably fair to say that the most prolific sex lives in Eleanor Herman's chatty book belong to Warren G. Harding, John F. Kennedy and Donald Trump, each of whom merits 32 tawdry pages.
To be fair about the current occupant of the Oval Office, none of the Stormy Daniels/Miss America anecdotes in "Sex With Presidents" date to his presidency, so the title is inaccurate in his case. Same goes for the chapters on Gary Hart and Alexander Hamilton, both of whom had plenty of sex without the benefit of a presidency.
Because Herman's un-footnoted "Sex With Presidents" is a work of "popular nonfiction," not scholarship, she cuts corners elsewhere, too. Faced with no historical record on what a Hamilton conquest looked like, Herman invents one.
I'm not sure why she declines to call Thomas Jefferson a rapist, since that's what his treatment of underage, enslaved Sally Hemings amounts to. And Herman seems to confirm 15th president James Buchanan's long-rumored homosexuality, for instance, but offers no sourcing other than a chapter where she says her stories about presidents have been well-documented elsewhere.
Herman is correct that many readers will have heard these tales, but she tells them with a gimlet eye and a talent for underscoring absurdity. There is value in collecting them the way Herman has, not just for trivia buffs (if you're ever in a contest where you're required to know that Harding called his penis "Jerry," you're welcome) but also for study of the American presidency.
Herman looks at research into power and hubris and concludes that the link is direct: "Some leaders are successful because they are crazy."