beat off vs touch oneself

beat off

verb
  • To masturbate, usually a man of himself. 

  • To waste time. 

  • To drive something away with blows or military force. 

touch oneself

verb
  • To masturbate. 

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

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