Third gender is a gender identity. If someone is of the third gender, they are considered neither male nor female, whether by their will or by social consensus. Not to be mistaken for third sex. Sex and gender are not synonymous. Sex refers to whether they are biologically male or female. Gender is a state of mind. One can be born female, but live as a male. This has no influence on sexual orientation, nor vice versa. Typically, those of the third gender prefer to be referred to using gender-neutral pronouns, such as one, ze, sie, hir, or ey.
Evan was born a male, but hir is third gendered.