concupiscence vs libido

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. 

libido

noun
  • Sexual urges or drives. 

  • Drives or mental energies related to or based on sexual instincts but not necessarily sexual in and of themselves. 

  • Synonym of albedo in terms of a planet's, such as that of Mars, average surface spectral reflectivity. 

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