mons pubis vs netherhair

mons pubis

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

netherhair

noun
  • Hair on or around the lower parts of the body, specifically around the genital areas; pubic hair. 

How often have the words mons pubis and netherhair occurred in a corpus of books? (source: Google Ngram Viewer )