BOB vs lady parts

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. 

lady parts

noun
  • The breasts and/or genitalia of a woman or women. 

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