crown jewels vs pubic region

crown jewels

noun
  • The male genitalia. 

  • The jewelry that accompany the office of rulership in a monarchy, i.e. crown, scepter, signet ring, etc. 

pubic region

noun
  • The central part of the (notably human) body near the pubes and the pubis, including the genitalia. 

How often have the words crown jewels and pubic region occurred in a corpus of books? (source: Google Ngram Viewer )