bisexuality vs homosexualism

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. 

homosexualism

noun
  • A purported ideology behind (and promoting) homosexuality; gayness viewed as an ideology rather than a sexual orientation. 

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