The author seems to not little about BDSM.
I dont know much... but I know it's a kink of very powerful woman. They actually control the interaction and the amount of humiliation/pain they desire. The "master" is just a tool.
And the author ignore the fact, that submissive male are common.. and usually are very powerful people, also very directive on the pain/humiliation they want.
The fact that 50 shades, apparently a bad depiction of BDSM, got so much success, might actually mean something. But I wont trust the author with analyzing it.
For once I seems to know something Klein ignore! Onan was a biblical character, very alone.. and Candaulism come from the King Candaules who liked to have his wife taken before his eyes