heterosexualism vs sexual preference

heterosexualism

noun
  • 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. 

  • Synonym of heterosexuality 

sexual preference

noun
  • Sexual orientation. 

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