bigender vs same-sex

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. 

same-sex

adj
  • Of, relating to, or between homosexual men or women. 

  • Restricted to members of a single sex. 

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