night emission vs orgasm

night emission

noun
  • An ejaculation or orgasm while asleep, often accompanied by an erotic dream. 

orgasm

noun
  • A rush of sexual excitement; now specifically, the climax or peak of sexual pleasure, which occurs during sexual activity and which in males may include ejaculation and in females vaginal contractions. 

  • A creamy white alcoholic cocktail containing amaretto, Irish cream, and coffee liqueur. 

verb
  • To have an orgasm. 

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