lewd vs stag film

lewd

noun
  • A sexually suggestive image, particularly one which does not involve full nudity. 

verb
  • To express lust; to behave in a lewd manner. 

adj
  • Lascivious, sexually promiscuous, rude. 

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