autoeroticism vs self-pleasing

autoeroticism

noun

  • The practise of stimulating oneself sexually, masturbation 

self-pleasing

noun

  • masturbation 

adj

  • That pleases oneself; given over only to one's own pleasure. 

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