hardcore vs stag film

hardcore

noun
  • Hardcore techno. 

  • Outlaw country. 

  • Jungle. 

  • Gangsta rap. 

  • Broken bricks, stone and/or other aggregate used as foundations, especially in road and path laying. 

  • Hardcore punk. 

adj
  • Having an extreme dedication to a certain activity. 

  • Particularly intense; thrillingly dangerous or erratic; desirably violent in appearance; pleasing or "cool" due to intensity or danger. 

  • Resistant to change. 

  • Depicting penetration and abnormal sexual activity. 

  • Obscene or explicit. 

  • Faster or more intense than the regular style. 

stag film

noun
  • A kind of pornographic film produced clandestinely in the early to mid-20th century, typically short and without sound. Usually intended for a male audience. 

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