In 1939, when Geisel (aka Dr. Seuss) left Vanguard for Random House, he had one condition for his new publisher, Bennett Cerf — that he would let Geisel do an “adult” book first. The result was The Seven Lady Godivas: The True Facts Concerning History’s Barest Family, which tells the story of nudist sisters who, after their father’s death, pledge not to wed until each of them has “brought to the light of the world some new and worthy Horse Truth, of benefit to man.” (From Brainpickings.org)

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