cold fish vs dead fish

cold fish

noun
  • A sexual partner who, during sex, lacks vigor or emotional reciprocity. 

  • A heartless individual; a person lacking empathy and emotion. 

dead fish

noun
  • A sexual partner who lies flat and unresponsive during sex. 

  • A hit that travels a limited distance and then falls straight to the ground. 

  • Used other than figuratively or idiomatically: see dead, fish. 

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