genital organ vs parts

genital organ

noun
  • An organ used in sexual reproduction or sexual stimulation; a sex organ; (in plural) genitalia. 

parts

noun
  • The genitals, short for private parts. 

  • Intellectual ability or learning. 

  • Vicinity, region. 

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