bisexuality vs heterosexualism

bisexuality

noun
  • The state of being bisexual (“having both male and female parts or roles”). 

  • The state of being sexually or romantically attracted to members of either sex or gender. 

heterosexualism

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

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

  • Synonym of heterosexuality 

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