bisexuality vs transsexualism

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. 

transsexualism

noun
  • Transsexuality; the state of being transsexual. 

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