Casanova vs femme fatale

Casanova

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

  • A promiscuous, philandering man. 

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

femme fatale

noun
  • An attractive and seductive but ultimately dangerous woman. 

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