A podcast featured on 'Stuff Mom Never Told You' explores the Dominatrix, and does it very well. It's a 48 minute podcast with dialogue between Cristen and Caroline as part of Kink Week. They discuss the Dominatrix image in fashion, in photography from Man Ray, Helmut Newton, through to the history of the professional Dominatrix and what she does for her clients. (Length: 48 mins, 33 secs)
My research on the Dominatrix (from 'The History & Arts of the Dominatrix') is mentioned a number of times within the segment, including on erotic flagellation, along with that of other academics - including Danielle Lindemann.
You can listen to the Dominatrix podcast at: http://www.stuffmomnevertoldyou.com/podcasts/the-professional-dominatrix/