impure vs phallic

impure

adj
  • Unchaste; obscene (not according to or not abiding by some system of sexual morality) 

  • Containing undesired intermixtures 

  • Unhallowed; defiled by something unholy, either physically by an objectionable substance, or morally by guilt or sin 

phallic

adj
  • Relating to, or characteristic of the penis. 

  • Shaped like an erect human penis. 

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