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Although the genitals are a key part of sex, its pleasurable sensations involve many parts of the body. Pleasurable sex heavily depends on the brain, which releases hormones that support sexual pleasure and interpret stimulation as pleasurable. One study suggests that the brain could be the most important sexual organ. The author found that orgasm is a heightened state of sensory awareness that can trigger a trance-like state in the brain. In this article, we examine the effects that sex has on the body and the brain, as well as how these effects make sex feel good.
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Sex and gender: What is the difference?

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Gender Ratio - Our World in Data

Historically, the terms "sex" and "gender" have been used interchangeably, but their uses are becoming increasingly distinct, and it is important to understand the differences between the two. This article will look at the meaning of "sex" and the differences between the sexes. It will also look at the meaning of "gender," and the concepts of gender roles, gender identity, and gender expression. In general terms, "sex" refers to the biological differences between males and females, such as the genitalia and genetic differences. Sometimes, a person's genetically assigned sex does not line up with their gender identity. These individuals might refer to themselves as transgender, non-binary, or gender-nonconforming.
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Gender Ratio

The ratio between the number of males and females in a society is referred to as the gender ratio. This ratio is not stable but instead shaped by biological, social, technological, cultural, and economic forces. And in turn the gender ratio itself has an impact on society, demography, and the economy. In this entry we provide an overview of the variation and the changes of the gender ratio across the world. We study how it changes from birth to late life; the forces that change the ratio of men to women.
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Sex differences in humans have been studied in a variety of fields. In humans, biological sex consists of five factors present at birth: the presence or absence of the SRY gene an intronless sex-determining gene on the Y chromosome , the type of gonads , the sex hormones , the internal reproductive anatomy such as the uterus , and the external genitalia. Phenotypic sex refers to an individual's sex as determined by their internal and external genitalia, expression of secondary sex characteristics, and behavior. The sex of the individual can be defined in different ways, giving rise to different conceptual frameworks about what determines sex. A subset of such differences is hypothesized to be the product of the evolutionary process of sexual selection.
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