piece of ass vs sex kitten

piece of ass

noun
  • A very attractive woman, when considered as a sex object. 

  • An act of intercourse, especially a one-night stand. 

  • A male prostitute. 

sex kitten

noun
  • A woman who is both sexually desirable and sexually active. 

How often have the words piece of ass and sex kitten occurred in a corpus of books? (source: Google Ngram Viewer )