Wetlands , by Charlotte Roche, has sold over 680,000 copies and is "the only German book to top Amazon.com's global best-seller list. With her jaunty dissection of the sex life and the private grooming habits of the novel's 18-year-old narrator, Ms. Roche has turned the previously unspeakable into the national conversation in Germany." How dirty is it? "It is difficult to overstate the ...