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Sex differences in humans have been studied in a variety of fields. In humans, biological sex is determined by five factors present at birth: the presence or absence of a Y chromosome, the type of gonads, the sex hormones, the internal reproductive anatomy (such as the uterus in females), and the external genitalia. People with mixed sex factors are intersex. People whose internal experience differ from their biological sex are transgender or transsexual.
A distinction is sometimes made between sex and gender. Sex differences generally refer to traits that are sexually dimorphic. Such differences are hypothesized to be products of the evolutionary process of sexual selection. In contrast, the term "gender differences" refers to average group differences between males and females that are presumably based on sexually monomorphic (the same between the sexes) biological adaptations—and these group differences are presumed to be due primarily to differential socialization. Gender identity refers to one's preferred social role, regardless of whether the person is intersex or biologically the other sex.
- Knox, David; Schacht, Caroline. Choices in Relationships: An Introduction to Marriage and the Family. 11 ed. Cengage Learning; 2011-10-10 [cited 17 June 2013]. ISBN 9781111833220. p. 64–66.
- Mealey, L. (2000). Sex differences. NY: Academic Press.
- Geary, D. C. (2009) Male, Female: The Evolution of Human Sex Differences. Washtington, D.C.: American Psychological Association
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