eroticism vs gendersex

eroticism

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

  • sexual excitement, especially if abnormally persistent 

gendersex

noun
  • sex or gender. A division of organisms into masculine(man/male), feminine(woman/female) or others by sexual characteristics or social characteristics. 

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