fornication vs sexual marketplace

fornication

noun
  • Sexual intercourse by people who are not married to each other, or which is considered illicit in another way. 

  • Sexual intercourse in general; sex. 

sexual marketplace

noun
  • Prostitution. 

  • The way in which people's desirability as sexual or romantic partners is evaluated. 

  • A location or situation in which people are looking for sexual or romantic partners. 

How often have the words fornication and sexual marketplace occurred in a corpus of books? (source: Google Ngram Viewer )