blowjob vs fellation

blowjob

noun
  • Excessive praise. 

  • An act of fellatio, or sucking a penis or other phallic object (such as a dildo). Stimulation of somebody's penis or testicles with a person's lips, tongue or mouth with the purpose of giving the receiver sexual pleasure. It may or may not result in orgasm. 

fellation

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