fap vs solo sex

fap

noun
  • A session of masturbation. 

intj
  • To indicate that someone (normally the speaker) is either masturbating, or inspired to by sexual arousal. 

  • Pornography. 

verb
  • To masturbate. 

solo sex

noun
  • masturbation 

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