boff vs live together

boff

verb
  • to have sexual intercourse (with someone) 

  • To hit; to strike. 

noun
  • A great success; a hit. 

  • A pupil who works hard; a swot. 

  • A line in a film etc that elicits such a laugh. 

  • A big laugh. 

  • A hit or smack. 

live together

verb
  • To cohabit and have sexual relations while not being married. 

  • Used other than figuratively or idiomatically: see live, together. 

How often have the words boff and live together occurred in a corpus of books? (source: Google Ngram Viewer )