The conclusion of an in-depth interview about the History of BDSM with author Peter Tupper, whose new book "The Innocent's Progress" is due out any day from Circlet Press. I first came across Peter's work in Like a Wisp of Steam, an anthology of steampunk erotica, so I'm thrilled at the chance to talk about the history of Master/slave as an erotic model, the role of cultural media in what it is we do.