milking vs wringing

milking

noun
  • The act by which any animal is milked. 

  • Male masturbation (or fellatio) that leads to the release of semen, especially when performed on a milking table. 

wringing

noun
  • The act by which something is wrung. 

How often have the words milking and wringing occurred in a corpus of books? (source: Google Ngram Viewer )