In the social sciences, the term sex refers to the biological categories of male and female (and potentially other categories, as discussed later in this chapter). The sex of a person is determined by an examination of biological and anatomical features, including (but not limited to): visible genitalia (e.g., penis, testes, vagina), internal sex organs (e.g., ovaries, uterus), secondary sex characteristics (e.g., breasts, facial hair), chromosomes (XX for females, XY for males, and other possibilities), reproductive capabilities (including menstruation), and the activities of growth hormones, particularly testosterone and estrogen. It may seem as though nature divides humans neatly into females and males, but such a long list of distinguishing factors results in a great deal of ambiguity and diversity within categories. For instance, hormonal influences can produce results different from the ways that people typically develop. Hormonal influences shape the development of sex organs over time and can stimulate the emergence of secondary sex characteristics associated with the other sex. Clothes on or clothes off, people can have body features associated with one sex category and chromosomes associated with another. While sex is based on biology, the term gender was developed by social scientists to refer to cultural roles based on these biological categories. The cultural roles of gender assign certain behaviors, relationships, responsibilities, and rights differently to people of different genders. As elements of culture, gender categories are learned rather than inherited or inborn, making childhood an important time for gender enculturation. As opposed to the seeming universality of sex categories, the specific content of gender categories is highly variable across cultures and subject to change over time. The two terms, biological sex and cultural gender, are often distinguished from one another to clarify the differences embedded in “nature” versus the differences constructed by “culture.” But are biological sex categories based on an objective appraisal of nature? Are sex categories universal and durable? Some scholars question the biological objectivity of sex and its opposition to the more flexible notion of gender. Figure 12.2 Transgender activist Aurora Claire Borin at a women’s march in Calgary, Canada. (credit: “Women’s March in Calgary” by JMacPherson/flickr, CC BY 2.0) Associated with sex and gender, the concept of sexuality refers to erotic thoughts, desires, and practices and the sociocultural identities associated with them. The complex ways in which people experience their own bodies and perceive their own gender contribute to the physical behaviors they engage in to achieve pleasure, intimacy, and/or reproduction. This complex of thoughts, desires, and behaviors constitutes a person’s sexuality. Some cultures have very strict cultural norms regarding sexual practices, while others are more flexible. Some cultures confer a distinctive identity on people who practice a particular form of sexuality, while others allow a person to engage in an array of sexual practices without adopting a distinctive identity associated with those practices (Nanda 2000). Sexual orientation refers to sociocultural identities associated with specific forms of sexuality. For instance, in American culture, sex between a woman and a man is conventionalized into the normative identity of heterosexual. If you are a person who practices that kind of sex (and only that kind), then most Americans would consider you to be a heterosexual person. If you are a person who engages in sex with someone of the same sex/gender category, then in American culture, you would be considered a gay person (if you identify as male) or a lesbian (if you identify as female). So anxious are Americans about these categorical identities that many young people who have erotic dreams or passing erotic thoughts about a same-sex friend may worry that they are “really” not heterosexual. As American norms have changed over the past several decades, some people who have romantic, emotional, or erotic feelings toward people of their own gender and another gender have adopted the identity of bisexual. People who may have erotic desires about and relations with others without regard to their biological sex, gender identity, or sexual orientation may consider themselves to be pansexual. Even more recently, some people who do not engage in sexual thoughts, desires, or practices of any kind have embraced the identity of asexual. While there are many aspects and manifestations of sexual orientation, sexual orientation is considered to be a central and durable aspect of a person’s sociocultural identity. In some cultures, heterosexuality was previously thought to be the most “natural” form of sexuality, a notion called heteronormativity. This notion has been challenged by research and the growth of the global LGBTQIA+ movement. In many other cultures, people are allowed or even expected to engage in more than one form of sexuality without necessarily adopting any specific sexual identity. This is not to say that these other cultures are consistently more liberal and tolerant of sexual diversity. In many societies, it is acceptable for people to engage in same-sex practices in certain contexts, but they are still expected to marry someone of the opposite sex and have children. Scholars who have studied sexuality in many cultures have also pointed out that a person’s gender identity, sexual orientation, and sexuality tend to change significantly over the life span, responding to different contexts and relationships. The term queer, originally a pejorative term in American culture for a person who did not conform to the rigid norms of heterosexuality, has been appropriated by people who do not abide by those norms, particularly people who take a more situational and fluid approach to the expression of gender and sexuality. Rather than a set of fixed and durable identities, queer gender and sexuality are more fluid, constantly emerging, and contingent on multiple factors. As complex as sex, gender, and sexuality can be, it is helpful to have a diagram illustrating the possible relationships among these factors. Activist Sam Killermann has developed a useful diagram known as “The Genderbread Person,” depicting the various aspects of identity, attraction, expression, and physical characteristics that combine in the gender/sexuality of whole persons. Figure 12.3 Sam Killermann’s “Genderbread Person” illustrates how identity, attraction, expression, and physical characteristics all contribute to gender and sexuality. (credit: “Genderbread Person v4” by Sam Killermann/Wikimedia Commons, Public Domain)

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