Spanish fly vs amorous

Spanish fly

noun
  • A supposed aphrodisiac extracted from the beetle Lytta vesicatoria; cantharidin, the active ingredient, a vesicant used as a defence by L. vesicatoria and other blister beetles. 

  • The beetle Lytta vesicatoria. 

amorous

adj
  • Inclined or having a propensity to love, or to sexual enjoyment. 

  • Indicating love or sexual desire. 

  • Of or relating to, or produced by, love. 

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