Gender identity is one's personal experience of one's own gender. Gender identity can correlate with assigned gender at birth or can differ from it. All societies have a set of gender categories that can serve as the basis for the formation of a person's social identity in relation to other members of society. In most societies, there is a basic division between gender attributes assigned to males and females, a gender binary to which most people adhere and which includes expectations of masculinity and femininity in all aspects of intercourse and gender: biological intercourse, gender identity, and gender expression...