escort agency vs massage parlor

escort agency

noun
  • A company that provides customers with companions for a fee, usually for sexual services, which services are not performed on company premises. 

massage parlor

noun
  • A place that offers a happy ending (a hand job) after the massage; a front organization for a brothel. 

  • A place where clients can pay for a massage. 

How often have the words escort agency and massage parlor occurred in a corpus of books? (source: Google Ngram Viewer )