Sexual characteristics in the context of "Intersex"

Intersex people are those born with any of several sex characteristics, including chromosome patterns, gonads, or genitals that, according to the Office of the United Nations High Commissioner for Human Rights, "do not fit typical binary notions of male or female bodies". The opposite of intersex is endosex, which describes persons born with sex characteristics that are seen as typically male or female at birth.

Sex assignment at birth usually aligns with a child's external genitalia. The number of births with ambiguous genitals is in the range of 1:4,500–1:2,000 (0.02%–0.05%). Other conditions involve the development of atypical chromosomes, gonads, or hormones. The portion of the population that is intersex has been reported differently depending on which definition of intersex is used and which conditions are included. Estimates often range from 0.018% (one in 5,500 births) to 1.7%. The difference centers on whether conditions in which chromosomal sex matches a phenotypic sex which is clearly identifiable as male or female, such as late onset congenital adrenal hyperplasia (1.5 percentage points) and Klinefelter syndrome, should be counted as intersex. Whether intersex or not, people may be assigned and raised as a girl or boy but then identify with another gender later in life, while most continue to identify with their assigned sex.

Puberty is the process of physical changes through which a child's body matures into an adult body capable of sexual reproduction. It is initiated by hormonal signals from the brain to the gonads: the ovaries in a female, the testicles in a male. In response to the signals, the gonads produce hormones that stimulate libido and the growth, function, and transformation of the brain, bones, muscle, blood, skin, hair, breasts, and sex organs. Physical growth—height and weight—accelerates in the first half of puberty and is completed when an adult body has been developed. Before puberty, the external sex organs, known as primary sexual characteristics, are sex characteristics that distinguish males and females. Puberty leads to sexual dimorphism through the development of the secondary sex characteristics, which further distinguish the sexes.

On average, females begin puberty at age 10½ and complete puberty at ages 15–17; males begin at ages 11½–12 and complete puberty at ages 16–17. The major landmark of puberty for females is menarche, the onset of menstruation, which occurs on average around age 12½. For males, first ejaculation, spermarche, occurs on average at age 13. In the 21st century, the average age at which children, especially females, reach specific markers of puberty is lower compared to the 19th century, when it was 15 for females and 17 for males (with age at first periods for females and voice-breaks for males being used as examples). This can be due to any number of factors, including improved nutrition resulting in rapid body growth, increased weight and fat deposition, or exposure to endocrine disruptors such as xenoestrogens, which can at times be due to food consumption or other environmental factors. However, more modern archeological research suggests that the rate of puberty as it occurs now is comparable to other time periods. Growth spurts began at around 10–12, but markers of later stages of puberty such as menarche had delays that correlated with severe environmental conditions such as poverty, poor nutrition, and air pollution. Puberty that starts earlier than usual is known as precocious puberty, and puberty which starts later than usual is known as delayed puberty.

Erotic art is a broad field of the visual arts that includes any artistic work intended to evoke arousal. It usually depicts human nudity or sexual activity, and has included works in various visual mediums, including drawings, engravings, films, video games, paintings, photographs, and sculptures. Some of the earliest known works of art include erotic themes, which have recurred with varying prominence in different societies throughout history. However, it has also been widely considered taboo, with either social norms or laws restricting its creation, distribution, and possession. This is particularly the case when it is deemed pornographic, immoral, or obscene.

Delayed puberty is when a person lacks or has incomplete development of specific sexual characteristics past the usual age of onset of puberty. The person may have no physical or hormonal signs that puberty has begun. In the United States, girls are considered to have delayed puberty if they lack breast development by age 13 or have not started menstruating by age 15. Boys are considered to have delayed puberty if they lack enlargement of the testicles by age 13.5 . Delayed puberty affects about 2% of adolescents.

Most commonly, puberty may be delayed for several years and still occur normally, in which case it is considered constitutional delay of growth and puberty, a common variation of healthy physical development. Delay of puberty may also occur due to various causes such as malnutrition, various systemic diseases, or defects of the reproductive system (hypogonadism) or the body's responsiveness to sex hormones.

Gender-affirming surgery (GAS) is a surgical procedure, or series of procedures, that alters a person's physical appearance and sexual characteristics to resemble those associated with their gender identity. The phrase is most often associated with transgender health care, though many such treatments are also pursued by cisgender individuals. It is also known as sex reassignment surgery (SRS), gender confirmation surgery (GCS), and several other names.

Professional medical organizations have established Standards of Care, which apply before someone can apply for and receive reassignment surgery, including psychological evaluation, and a period of real-life experience living in the desired gender.

The history of erotic depictions includes paintings, sculpture, photographs, dramatic arts, music and writings that show scenes of a sexual nature throughout time. They have been created by nearly every civilization, ancient and modern. Early cultures often associated the sexual act with supernatural forces and thus their religion is intertwined with such depictions. In Asian countries such as India, Nepal, Sri Lanka, Japan, Korea, and China, representations of sex and erotic art have specific spiritual meanings within native religions. The ancient Greeks and Romans produced much art and decoration of an erotic nature, much of it integrated with their religious beliefs and cultural practices.

In more recent times, as communication technologies evolved, each new technique, such as printing, photography, motion pictures and computers, has been adapted to display and disseminate these depictions.