hook up vs live together

hook up

verb
  • To have a casual sexual experience with another person, usually without any future relationship intended. 

  • To connect to something like a power supply or a signal source. 

  • To assemble the parts of a mechanism, especially by connecting wires. 

  • To supply someone with goods or services. 

  • To form an association (with) someone. 

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 hook up and live together occurred in a corpus of books? (source: Google Ngram Viewer )