love nest vs watering hole

love nest

noun
  • A place suitable for or used for having sexual intercourse. 

  • A residence, especially a condominium or cabin, where a couple (particularly a newly cohabiting/married couple) can enjoy each other's company. 

  • The vagina. 

watering hole

noun
  • A bar or other local drinking establishment. 

  • A depression in which water collects and where animals come to drink. 

How often have the words love nest and watering hole occurred in a corpus of books? (source: Google Ngram Viewer )