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e. Sexual orientation is an enduring personal pattern of romantic attraction or sexual attraction (or a combination of these) to persons of the opposite sex or gender, the same sex or gender, or to both sexes or more than one gender. Patterns are generally categorized under heterosexuality, homosexuality, and bisexuality, [ 1 ][ 2 ][ 3 ] while ...
Psychological sex differences refer to emotional, motivational, or cognitive differences between the sexes. [9][8] Examples include greater male tendencies toward violence, [10] or greater female empathy. The terms "sex differences" and "gender differences" are at times used interchangeably, sometimes to refer to differences in male and female ...
Gender identity is the personal sense of one's own gender. [1] Gender identity can correlate with a person's assigned sex or can differ from it. In most individuals, the various biological determinants of sex are congruent, and consistent with the individual's gender identity. [2] Gender expression typically reflects a person's gender identity ...
Sexual differentiation in humans is the process of development of sex differences in humans. It is defined as the development of phenotypic structures consequent to the action of hormones produced following gonadal determination. [1] Sexual differentiation includes development of different genitalia and the internal genital tracts and body hair ...
v. t. e. The relationship between the environment and sexual orientation is a subject of research. In the study of sexual orientation, some researchers distinguish environmental influences from hormonal influences, [1] while other researchers include biological influences such as prenatal hormones as part of environmental influences.
The World Health Organization 's defines gender as "socially constructed", and sex as characteristics that are "biologically determined", drawing a distinction between the sex categories of male and female, and the genders "girls and boys who grow into men and women". [95]
A review of retrospective studies that measured gender nonconforming traits estimated that 89% of homosexual men exceeded heterosexual males level of gender nonconformity, whereas just 2% of heterosexual men exceeded the homosexual median. For female sexual orientation, the figures were 81% and 12% respectively.
Sex differences in humans have been studied in a variety of fields. Sex determination generally occurs by the presence or absence of a Y chromosome in the 23rd pair of chromosomes in the human genome. Phenotypic sex refers to an individual's sex as determined by their internal and external genitalia and expression of secondary sex characteristics.