dangly bits vs genital organ

dangly bits

noun
  • Male genitalia, usually of a baby, child, or of a smaller than usual size; ironic reference to male genitalia. 

genital organ

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

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