fingering vs jerk off

fingering

noun
  • The act of using the fingers to penetrate and sexually stimulate one's own or another person's vagina or anus. 

  • The act of using one's fingers in the playing of a musical instrument. 

  • A thick woollen yarn for stockings. 

  • A specific method of using the fingers to play an instrument. 

jerk off

noun
  • An act of masturbation. 

  • A stunt in which the performer is suddenly pulled off a horse, etc. by means of a cable. 

  • An annoying person. 

verb
  • To deceive. 

  • To masturbate, usually a male. 

  • To do nothing; to waste time. 

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