Despite the fact that their sexual preferences are listed in the fifth edition of the Diagnostic and Statistical Manual of Mental Disorders as potentially problematic, people who play with whips and chains in the bedroom may actually be more psychologically healthy than those who don't.
http://www.livescience.com/34832-bdsm-healthy-psychology.html
(http://i.livescience.com/images/i/000/051/041/original/handcuffs-130529.jpg?1369855977)
http://www.huffingtonpost.com/2013/06/05/bdsm-better-mental-health-study_n_3390676.html