eroticism vs gender identity

eroticism

noun
  • the state of being erotic, or of being sexually aroused 

  • sexual excitement, especially if abnormally persistent 

gender identity

noun
  • A person's internal sense of self as belonging to a particular gender or genders, or to no gender. 

How often have the words eroticism and gender identity occurred in a corpus of books? (source: Google Ngram Viewer )