pleasure oneself vs self-pleasure

pleasure oneself

verb

  • To masturbate. 

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

self-pleasure

verb

  • To pleasure oneself; masturbate. 

noun

  • masturbation 

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