Sex

Sex is a Somali term with two closely related meanings: one refers to the biological category of reproduction—the division of living organisms into male and female based on the reproductive gametes they produce—and the other to the union of male and female (also called wasmo). This article primarily addresses the biological aspect, noting the distinction between these senses.

Many types of living organisms reproduce through the combination of two kinds of reproductive cells. The larger, nutrient-storing cell is called an egg (the female gamete), while the smaller, mobile cell is a sperm cell or spermatozoon (the male gamete). An organism becomes male if it produces the smaller cells and female if it produces eggs. Some organisms, particularly certain plants and some fish, can produce both gametes.

How sex is determined

In humans and many other animals, biological sex is governed by chromosomes. Females typically have two X chromosomes, while males have one X and one Y. The Y chromosome carries a gene responsible for initiating sperm production; without it, the offspring develops as female. Subsequently, hormones such as testosterone and estrogen influence the development of reproductive organs and other bodily traits. Other organisms use different systems: birds employ a ZW system, and in some reptiles and amphibians, sex depends on the temperature at which the egg incubates.

Bodily variation

The distinction between male and female is not always straightforward. There exist conditions called intersex, in which chromosomes, hormones, or bodily structure do not conform fully to typical patterns. These cases show that biological sex consists of multiple levels: chromosomal, internal organs, external organs, and hormonal.

Union and reproduction

Many terrestrial organisms reproduce when male gametes combine with those within the female body. This requires bodily union, the process by which male gametes are transferred. In humans, union is not only a reproductive act; it is also part of social relations, marriage, and health. For this reason, education on the subject draws on medicine, sociology, law, and religion, not biology alone.