nethers vs pudendum

nethers

noun
  • The private parts of the body, particularly the sex organs. 

pudendum

noun
  • An external genital organ in a human; especially a woman’s vulva. 

  • A person’s genital organ, mons pubis, anus, and buttocks collectively. 

  • A shameful part of something. 

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