Debunking the Myth of Biological Sex

Published February 11th, 2025

Language evolves.

As we—as human beings, uncover more knowledge about our bodies and experiences, we also uncover false binaries we’ve historically accepted as Truth. One of the biggest? The sex binary—in this instance, sex refers to our physical characteristics—hormones, chromosomes, genitalia, and secondary sex traits.

But here’s the thing: bodies are more complex than a simple binary.

Gender ≠ The Body

Our current cultural reckoning invites us to understand that gender is not inherently tied to the body.

We also need to integrate understanding that sex, as we’ve defined it, is a construct with real world consequences, too.

Why Biological Sex is a Problematic Term

+ It has been weaponized to dismiss the lived experiences of trans and non-binary people, often used to invalidate gender identity and uphold exclusionary policies.

+ It is frequently invoked to justify discrimination in healthcare, sports, education, and legal protections.

+ It ignores the reality of intersex people, whose existence alone disproves the idea of a strict male/female binary.

The more accurate term: sex assigned at birth

Using sex assigned at birth acknowledges that:

+ It’s an assignment that may or may not resonate with the individual.
+ It’s based on genitalia, which does not define gender.
+ It does not necessarily relate to identity.
+ It is not binary—intersex people exist!

Language shapes reality. Words matter. Sex and gender are two distinct aspects of our embodied experience as human beings.

The more we shift how we speak about gender and sex, the more we can dismantle false binaries and affirm transgender, non-binary, and intersex people. Of course, we must also commit to taking action beyond language, too.

Actions to consider:

+ Shift Your Language – Use “sex assigned at birth” instead of “biological sex” when discussing the body.

+ Correct Misinformation – If you hear someone reinforcing the sex binary, engage them in conversation.

+ Advocate for Policy Change – Support inclusive policies in workplaces, schools, and healthcare settings.

+ Center Trans & Intersex Voices – Follow, learn from, and amplify educators and activists doing this work.

Reflection questions:

+ Have I ever assumed someone’s gender based on their physical traits?
+ Where did I first learn about the sex binary? How has that shaped my beliefs?
+ How have I learned about and been shaped by the gender binary?
+ What are ways I benefit from these false binaries?
+ How can I create spaces where trans and intersex people feel affirmed and safe?

Learn more + take action.

Understanding language is just the start. Allyship requires action.

Join my on-demand webinar, TRANS 101+. This hour-long instant-access workshop covers the basics and explores how to make meaningful change toward trans affirmation and justice.

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