erect penis vs phallus

erect penis

noun
  • a penis that is engorged with blood 

phallus

noun
  • A penis, especially when erect. 

  • A representation of an erect penis symbolising fertility or potency. 

  • The signifier of the desire of the Other, and the signifier of jouissance. 

  • A similar erectile sexual organ present in the cloacas of male ratites. 

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