assfuck vs butt-fucking

assfuck

noun
  • Sodomy, anal sex, an act of anal intercourse. 

  • A jerk; an obnoxious person. 

  • An act of stunning betrayal. 

verb
  • To betray. 

  • To engage in anal intercourse. 

butt-fucking

noun
  • anal sex 

adj
  • Engaging in anal sex 

How often have the words assfuck and butt-fucking occurred in a corpus of books? (source: Google Ngram Viewer )