LGBT Glossary

Biological sex

Definition

Biological sex is the classification of a person as male, female, or intersex based on their bodily characteristics.

Explanation

Biological sex is one of the components of sexual identity and is based on a combination of factors such as chromosomes, hormones, internal reproductive organs, and genitals. Although these elements are usually related, they do not always align with one another.

At birth, a sex is assigned to a person according to visible bodily characteristics, generally without a complete analysis of factors such as chromosomes or hormones. In some cases, especially in intersex people, this assignment may not reflect the full biological complexity of the person.

This system makes it possible to classify people, although it does not always capture the full complexity of biological variation.

Types of biological sex

Biological sex is commonly classified as:

• Male
• Female
• Intersex

These categories help describe biological sex, although they may include a wide diversity of variations.

Relationship with other components

Biological sex is one of the components of sexual identity.

It is related to:

• Gender identity → is not directly determined by biological sex
• Sexual orientation → does not depend on biological sex
• Gender expression → does not necessarily match assigned sex
• Sexual behavior → is not determined by biological sex

Common misconceptions

Understanding biological sex requires avoiding some oversimplified or inaccurate ideas that are still common.

Among the most frequent are:

• Believing that biological sex automatically determines gender identity
• Confusing biological sex with gender identity
• Assuming that only two completely fixed biological categories exist
• Ignoring the existence of intersex variations

Recognizing these distinctions helps foster a better understanding of sexual diversity and the complexity of human experience.

In the sexual identity model

In the model proposed by Moscas de Colores, biological sex is understood as one of the five components of sexual identity that, in relation to the others, contributes to sexual diversity. It does not act in isolation, but in interaction with the other components.

sexual identity model

Example

Two people with the same biological sex may have:

• different gender identities
• different sexual orientations
• different forms of gender expression

This shows that biological sex is only one part of sexual identity.

Conclusion

Biological sex describes a set of bodily characteristics, but it does not by itself define a person’s identity. Understanding it within a broader framework, such as sexual identity, helps avoid confusion and encourages a more complete understanding of sexual diversity.

Continue exploring sexual identity

Next component: 👉 Gender identity