danger zone vs male crotch bulge

danger zone

noun
  • the genitals 

  • A specifically hazardous place to be avoided, usually demarcated, such as an area with anti-personnel mines 

male crotch bulge

noun
  • the protrusion of male genitalia through clothing 

How often have the words danger zone and male crotch bulge occurred in a corpus of books? (source: Google Ngram Viewer )