S & M vs sadomasochism

S & M

sadomasochism

noun
  • Sadism and masochism: the (often sexual) enjoyment by one person of both inflicting and receiving pain. 

  • The practices of sadism and masochism collectively, usually in reference to consensual practices within the BDSM community. 

How often have the words S & M and sadomasochism occurred in a corpus of books? (source: Google Ngram Viewer )