BOB vs fanny

BOB

noun
  • Vibrator (device designed to stimulate a woman's genitals). 

adj
  • Back-of-the-book; denoting those stamps in a catalogue that are not used for the payment of regular postage fees, and are displayed separately in the catalogue after that listing; the division between these two groups varies with the publisher. 

fanny

noun
  • The female genitalia. 

  • The buttocks; arguably the most nearly polite of several euphemisms. 

  • Women viewed as sexual objects. 

  • Mess kettle or cooking pot. 

  • Sexual intercourse with a woman. 

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