bathhouse vs massage parlor

bathhouse

noun
  • A business with bath-like facilities, which chiefly serves as a place for sexual encounters, especially among men. 

  • A building where swimmers can change clothes. 

  • A building with baths for communal use. 

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 bathhouse and massage parlor occurred in a corpus of books? (source: Google Ngram Viewer )