genital vs sex organ

genital

noun
  • A genital organ. 

adj
  • Of, or relating to psychosexual development during puberty. 

  • Of, or relating to biological reproduction. 

  • Of, or relating to the genitalia. 

sex organ

noun
  • An organ used in sexual reproduction or sexual stimulation. 

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