john vs kerb crawler

john

noun
  • A prostitute's client. 

  • A device or place to urinate and defecate: now usually a toilet or lavatory, but also (dated) a chamber pot or outhouse. 

  • A male mule. 

  • A Western man traveling in East Asia. 

kerb crawler

noun
  • Someone who drives slowly along roads seeking sex from prostitutes or other women. 

How often have the words john and kerb crawler occurred in a corpus of books? (source: Google Ngram Viewer )