Ashley Dupre, the infamous former escort who had trysts with former-Gov. Eliot Spitzer, is the New York Post’s first eBook author. In “Tricks of the Trade,” Dupre gives sex and relationship advice with chapters like “I Love/Hate My Ex” and “Fetishes and Fantasies.” She responds to readers’ questions such as whether size matters and how to tell if someone is faking, and offers general bedroom encouragement. “Our greatest athletes haven’t won gold without persistence and intense training, so persist and train away!” she writes. Pulled from her “Ask Ashley” Post columns between 2009 and 2012, it’s available at most eBook retailers.