pansexuality vs sexual preference

pansexuality

noun
  • A sexual orientation characterized by the potential for aesthetic attraction, romantic love and/or sexual desire for people regardless of their gender or sex. 

  • Sexuality that encompasses all kinds of sexuality. 

sexual preference

noun
  • Sexual orientation. 

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