mons pubis vs pubic region

mons pubis

noun
  • A fleshy protuberance over the pubic bones that becomes covered with hair during puberty. 

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