full-frontal vs stag film

full-frontal

noun
  • A photograph showing a completely nude person, with all the genitalia. 

adj
  • Showing all the genitalia. 

  • Full-on; unrestrained. 

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 full-frontal and stag film occurred in a corpus of books? (source: Google Ngram Viewer )