self-abuse vs solo sex

self-abuse

noun
  • Physical or verbal maltreatment of oneself. 

  • Injury inflicted deliberately upon oneself, especially resulting from a mental disorder. 

verb
  • To harm oneself. 

solo sex

noun
  • masturbation 

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