heterosexualism vs sexual orientation

heterosexualism

noun
  • Synonym of heterosexuality 

  • Discrimination against non-heterosexual people on the basis of their sexual orientation. 

  • The state or existence of heterosexuality, including the traditional gender roles that accompany it. 

sexual orientation

noun
  • One's tendencies of sexual attraction, considered as a whole. 

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