bisexuality vs sexual orientation

bisexuality

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

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

sexual orientation

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

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