cunning linguist vs muff diver

cunning linguist

noun

  • One who performs cunnilingus. 

  • Used other than figuratively or idiomatically: see cunning, linguist. 

muff diver

noun

  • One who performs cunnilingus. 

  • A lesbian. 

How often have the words cunning linguist and muff diver occurred in a corpus of books? (source: Google Ngram Viewer )