colt's tooth vs concupiscence

colt's tooth

noun
  • Youthful desires, especially lust. 

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

concupiscence

noun
  • An ardent desire, especially sexual desire; lust. 

  • the desire of a person's lower appetite, contrary to reason, which subjugates and inclines them to experience temptation and to give in to sin, due to the Fall and original sin. 

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