With her jaunty dissection of the sex life and the private grooming habits of the novel's 18-year-old narrator, Helen Memel, Charlotte Roche has turned the previously unspeakable into the national conversation in Germany.Since its debut in February, the novel («Feuchtgebiete,» in German) has sold more than a million copies, and is the biggest selling book on Amazon anywhere in the world.The book is a headlong dash through every crevice and byproduct, physical and psychological, of its narrator's...