self-pleasure vs touch oneself

self-pleasure

verb

  • To pleasure oneself; masturbate. 

noun

  • masturbation 

touch oneself

verb

  • To masturbate. 

  • Used other than figuratively or idiomatically: see touch, oneself. 

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