sex work vs sexual marketplace

sex work

noun
  • Any job in which sex or eroticism is involved, especially prostitution or pornography. 

  • My mother distributes condoms and outreach materials to those that do sex work for a living in the Tenderloin and Mission. 

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 sex work and sexual marketplace occurred in a corpus of books? (source: Google Ngram Viewer )