colt's tooth vs eros

colt's tooth

noun
  • Youthful desires, especially lust. 

  • One of a horse's first set of teeth. 

eros

noun
  • Physical love; sexual desire. 

  • A winged figure of a child representing love and/or its power. 

  • a type of love that seeks fulfillment without violation or something else. 

  • libido 

  • collective instincts for self-preservation; life drive. 

How often have the words colt's tooth and eros occurred in a corpus of books? (source: Google Ngram Viewer )