chromo vs rent boy

chromo

noun
  • A prostitute. 

  • A color print produced by chromolithography. 

adj
  • Of or relating to the chromodomain, a protein structural domain associated with chromatin production 

rent boy

noun
  • A male prostitute, typically young and gay. 

How often have the words chromo and rent boy occurred in a corpus of books? (source: Google Ngram Viewer )