THE BOOK was placed on a high shelf in the den, as though it were the only copy in the world and if the children didn't find it they would be forever unaware of the sexual lives of their parents, forever ignorant of the press of hot skin, the overlapping voices, the stir and scrape of the brass headboard as it lightly battered the plaster, creating twin finial-shaped depressions over the years in the wall of the bedroom in which the parents slept, or didn't sleep, depending on the night.