The phenomenal success of Fifty Shades of Grey illuminated the potential of dominance and submission-themed sex for tens of millions of readers… and more specifically… erotic discipline. Of all the options in the infamous red room, Anna settled on the thought of getting a spanking, or actually being spanked by Christian, as her favorite turn-on and link to heightened sexual bliss. How do the rituals of corporal punishment become turn-ons for so many of those being punished or administering...