side bitch vs vixen

side bitch

noun
  • A mistress; a woman one dates in addition to his girlfriend or wife, usually in secret. 

vixen

noun
  • A wife who has sex with other men with her husband's consent. 

  • A female fox. 

  • A malicious, quarrelsome or temperamental woman. 

  • A racy or salacious woman who is sexually attractive. 

How often have the words side bitch and vixen occurred in a corpus of books? (source: Google Ngram Viewer )