Flagstaff vs Intercourse

Flagstaff

name
  • A town in Victoria, Australia. 

  • A city, the county seat of Coconino County, Arizona, United States. 

Intercourse

name
  • A particular town in the Commonwealth of Pennsylvania in the United States 

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