centerfold vs pin-up

centerfold

noun
  • A large photograph printed on this sheet, typically in the form of a nude, or provocatively dressed, sexually attractive woman or man. 

  • Any very sexually attractive person, who is therefore material for such a photograph. 

  • The person appearing in such a photograph. 

  • The single sheet of paper that forms the middle two pages of a magazine or other publication. 

pin-up

noun
  • A photograph, printed in a magazine or other publication, of a sexually attractive person (often nude or provocatively dressed), and intended to be removed and pinned up on a wall. 

  • The person so depicted. 

  • Figurehead, person who represents an idea, cause etc. 

How often have the words centerfold and pin-up occurred in a corpus of books? (source: Google Ngram Viewer )