Gender systems can affect what personal experience of one's own gender and how they fit in society?
Gender identity Gender identity is one's personal experience of one's own gender. Gender identity can correlate with assigned sex at birth, or can differ from it completely. All societies have a set of gender categories that can serve as the basis of 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 sex and gender: biological sex, gender identity, and gender expression. In all societies, some individuals do not identify with some (or all) of the aspects of gender that are assigned to their biological sex; some of those individuals are transgender or genderqueer. Some societies have third gender categories.
Darwin and women Charles Darwin's views on women were based on his view of natural selection. Darwin believed that the difference between males and females were partly due to "sexual selection." Darwin's theory of sexual selection, which can be found in his book "The Descent of Man and Selection in Relation to Sex," states that women, and some men, will choose to mate with someone that is most suitable to culture. This proposition of sexual selection readily tied into his theory of natural selection in the way that evolution will have different outcomes depending on the traits of the suitor the females chooses to reproduce with. This also supports his principle of "survival of the fittest" in the human species.