Casanova vs smooth operator

Casanova

noun
  • A promiscuous, philandering man. 

  • A man considered romantic and gallant, especially one who gives amorous attentions to women. 

name
  • A surname from the Romance languages, equivalent to English Newhouse. 

smooth operator

noun
  • A skillful, manipulative person, con artist, or clever scoundrel. 

  • A person who accomplishes tasks with efficiency and grace, especially one with verbal skills who is persuasive in interpersonal relationships, negotiation, etc. 

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