The Biological Determinants of Sex

Human sexual activity (or “sex”) is the act of having sexual intercourse with another person. Besides having sex, people engage in a variety of activities related to sex. Some people have only one sex partner and perform different activities with them. Some people perform several acts at once. Others may choose to have multiple partners. It is a personal choice and should be considered sensually appropriate for both parties.


The biological determinants of sex are largely congruent with a person’s gender identity. However, transgender persons may be assigned sex but have other characteristics that complicate sex assignment, or they may be intersex. For example, a person’s gonads may be different from another’s or the relative levels of sex-specific hormones are different. This results in the assignment of sex at birth.

The biological determinants of sex usually correspond to a person’s gender identity. The assigned sex is often the result of the same biological traits as the person’s gender. However, some people with transgender or intersex characteristics have traits that complicate sex assignment. For example, a person may have a pronounced sex, or be both female and male in appearance. In these cases, the biological determinants of sex are not identical to that of the person’s gender identity.

Although sex is not a matter of genes, it is often determined by environmental factors. Some species can change their sex during their lifetime. For example, in the clownfish family, the dominant female will change into a male and vice versa. In many wrasses, the dominant female will eventually change into a male when she reaches a certain size. In plants, it is also possible to switch from a female to a man if the species needs to reproduce.

In animal species, sex is a trait that determines how an individual develops. In female animals, the sex of the individual depends on the number of sex cells in the body. For example, in humans, the sex of the offspring is determined by the number of sex cells present in the organism. In males, these cells are larger and smaller than in females. These differences influence the appearance and functioning of an organism.

In humans, sex is a set of biological attributes. The females produce larger gametes than the females, and males produce smaller gametes than their female counterparts. Hermaphrodites are organisms that can produce both types of gametes. During sexual intercourse, both genders are able to develop. In addition, their offspring have different physical characteristics. Unlike females, the males have larger sex cells than the women.

There are many reasons why a person engages in sexual activity. SERC advocates placing pleasure at the center of sexual activity. It seeks to create a safe, nonviolent environment for both partners. This means that the sexuality of two people is different. Therefore, a man and a woman must have the same sex. If these two people have a child, it is important to recognize their sex differences and have it properly documented.