Gender in cultures

So I am soon going to be doing weekly sessions with a youth group at a youth center. I am also going to be doing a session with a youth empowerment program  about gender! Yay!

I have been researching about the history of gender identity and this is what I found:

There were many non-binary identities within cultures- 

Fa'afafine

In some Polynesian societies, fa'afafine are considered to be a third gender. They are anatomically male, but dress and behave in a manner considered typically feminine. According to Tamasailau Sua'ali'I , fa'afafine in Samoa at least are often physiologically unable to reproduce. Fa'afafine are accepted as a natural gender, and neither looked down upon nor discriminated against. Fa'afafine also reinforce their femininity with the fact that they are only attracted to and receive sexual attention from straight masculine men. They have been and generally still are initially identified in terms of labour preferences, as they perform typically feminine household task. The Samoan Prime Minister is patron of the Samoa Fa'afafine Association. Translated literally, fa'afafine means "in the manner of a woman.”

Hijras

In some cultures of Asia, a hijra is usually considered to be neither a man nor a woman. Most are anatomically male or intersex, but some are anatomically female. The hijra form a third gender role, although they do not enjoy the same acceptance and respect as males and females in their cultures. They can run their own households, and their occupations are singing and dancing, working as cooks or servants, sometimes prostitutes, or long-term sexual partners with men.

Khanith

The khanith form an accepted third gender in Oman. The khanith are male homosexual prostitutes whose dressing is male, featuring pastel colors (rather than white, worn by men), but their mannerisms female. Khanith can mingle with women, and they often do at weddings or other formal events. Khaniths have their own households, performing all tasks (both male and female).

Two-spirit identities

Many indigenous North American Nations had more than two gender roles. Those who belong to the additional gender categories, beyond cisgender man and woman, are now often collectively termed "two-spirit" or "two-spirited." There are parts of the community that take "two-spirit" as a category over an identity itself, preferring to identify with culture or Nation-specific gender terms. “Two-spirits” are often believed to have both feminine and masculine spirits and were highly respected.