cheesecake vs pornographic literature

cheesecake

noun
  • Imagery of scantily clad, sexually attractive young women; pin-ups. 

  • A pie made of sweetened and flavoured cottage cheese or cream cheese, eggs and milk on a crunchy base. 

pornographic literature

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