prat vs pubic region

prat

noun
  • The female genitals. 

  • A cunning or mischievous trick; a prank, a joke. 

  • A fool. 

  • A buttock, or the buttocks; a person's bottom. 

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 prat and pubic region occurred in a corpus of books? (source: Google Ngram Viewer )