TOOLKIT: Why Women Cannot Be Defined Solely by Biology
Ask this question: “If being a woman is solely about biology, how do we account for the experiences and identities of intersex people and trans women — who live as women, face gendered discrimination, and often share the same social realities as cisgender women?”
Defining women exclusively by biological characteristics—such as chromosomes, reproductive anatomy, or hormones—ignores the complexity of human identity and the lived experiences of millions of people. Biological sex itself is not a strict binary: intersex individuals, who are born with physical sex traits that don't fit typical definitions of male or female, are clear evidence that sex exists along a spectrum. Estimates suggest that around 1.7% of the population is born intersex — roughly the same as the number of people with red hair.
Moreover, gender is not the same as biological sex. Gender refers to an individual’s deeply held sense of identity, which is shaped by social, cultural, psychological, and historical factors. Many people, including trans women, identify and live as women despite being assigned male at birth. Their womanhood is real and valid — rooted in personal identity and affirmed by medical, legal, and social institutions in many parts of the world.
To reduce womanhood to biology alone is not only scientifically inaccurate but also socially harmful. It erases the identities of trans women, non-binary people, and intersex individuals, and it risks reinforcing stereotypes that have historically limited women's rights and roles in society.
Key Sources & Research
Intersex and Biological Variation United Nations Office of the High Commissioner for Human Rights (UN OHCHR)
https://www.ohchr.org/en/sexual-orientation-and-gender-identity/intersex-peopleSex Is Not Binary – Scientific Consensus Nature (2021) – “Sex Redefined”
https://www.nature.com/news/sex-redefined-1.16943Gender Identity and Recognition American Psychological Association (APA)
https://www.apa.org/topics/lgbtq/transgenderMedical Consensus on Trans Identities World Health Organization (WHO) and WPATH Standards of Care affirm that gender is a spectrum and that gender-affirming care is vital and evidence-based.
https://www.wpath.org/