crumpet vs sex on legs

crumpet

noun
  • A person (or, collectively, persons), usually female, considered sexually desirable. 

  • A type of savoury cake, typically flat and round, made from batter and yeast, containing many small holes and served toasted, usually with butter. 

sex on legs

noun
  • A person or persons considered to be very sexually attractive. 

How often have the words crumpet and sex on legs occurred in a corpus of books? (source: Google Ngram Viewer )