BOB vs erection

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. 

erection

noun
  • A penis or clitoris that is erect. 

  • The state or quality of being erect from engorgement with blood. 

  • The physiological process by which erectile tissue, such as a penis or clitoris, becomes erect by being engorged with blood. 

  • Formal approval and official establishment of an institution such as a society or a monastery by higher church authorities. 

  • Anything erected or built. 

  • The act of building or putting up or together of something. 

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