here's an excerpt of Janet Mock discussing mahuwahine, fa'afafine, and fakaleiti--pre-colonial Polynesian terms for transgender:(Kindle screenshot)https://farm1.staticflickr.com/302/18759517411_236aa26d85_b.jpghere are some other cultureshttps://en.wikipedia.org/wiki/Transgender#Transgender_people_in_non-Western_culturesalso, sciencehttps://en.wikipedia.org/wiki/Transgender#Brain-based_studies