bigender vs genderflux

bigender

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

  • Having two genders simultaneously: both male and female. 

genderflux

adj
  • Having a gender identity which fluctuates, either in intensity or between multiple genders. 

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