bigender vs unisex

bigender

adj
  • Having two genders simultaneously: both male and female. 

  • Having a tendency to move between feminine and masculine gender-typed behaviour depending on context. 

unisex

adj
  • Not distinguished on the basis of sex or gender; suitable for any sex or gender. 

noun
  • The state of not being distinguished on the basis of sex or gender; the state of being suitable for any sex or gender. 

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