jerk off vs solo sex

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. 

solo sex

noun
  • masturbation 

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