cohabit vs make it

cohabit

verb
  • To live together with someone else, especially in a romantic and sexual relationship but without being married. 

  • To coexist in common environs with. 

make it

verb
  • To have sexual intercourse; do it. 

  • Used other than figuratively or idiomatically: see make, it. 

  • To succeed in doing something, for example in reaching a place, going somewhere, attending an event, arriving in time for something, adding to one's schedule or itinerary, or in getting where one wants to be in one's life or career, which sometimes means becoming or wanting to become successful (succeed in a big way) or famous. 

  • To succeed in surviving, in living through something. 

How often have the words cohabit and make it occurred in a corpus of books? (source: Google Ngram Viewer )