Biological Sex Is Fixed at Conception, Not Assigned at Birth
The detransitioners in these stories emphasize that your sex is settled the moment egg meets sperm. "You're not assigned female at birth. Your sex is observed at birth. Your gender role is assigned at birth. Your sex is determined when you're conceived." – Star_Aries source [citation:925986de-8344-4a3a-b324-9603e6d842e6] A doctor simply looks at the body’s already-formed reproductive pathway and records what is already true. Even when infants are born with atypical genitals, the underlying blueprint—to produce either eggs or sperm—has not changed; any later confusion is only in human perception, not in biology.

Gametes and Reproductive Potential Are the Core Definition
Across the posts, people repeatedly return to one clear marker: the type of gamete the body was built to make. "Sex is defined by the two gametes—eggs and sperm—and every human is either one or the other, even if infertile." – die_in_alphabet_soup source [citation:94a75928-71e6-47c9-9c11-ef57dec90ac2] Secondary traits—breasts, beards, voice pitch—are described as downstream effects that can vary widely and may even be altered with hormones or surgery, but they never rewrite the original design. Infertility, mastectomy, or hormone-induced facial hair do not turn an egg-producer into a sperm-producer; they simply reflect changes in appearance or function, not a new sex.

Disorders of Sexual Development (DSDs) Do Not Create New Sexes
When detransitioners discuss intersex conditions, they frame them as disruptions along the same two pathways, not as evidence for additional sexes. "Individuals who don't produce gametes or produce both gametes are considered to have a disorder of sexual development. They are not a new sex." – jadepraerie source [citation:1ac8098d-599d-44c1-84ca-4ac5ead980f3] A person with a DSD still belongs to one of the two reproductive categories; the condition merely affects how fully that pathway can express itself. Recognizing this helps avoid the false conclusion that variation itself disproves the binary.

Gender Identity and Expression Are Separate from Biological Sex
Many writers draw a sharp line between the fixed reality of sex and the flexible realm of gender. "Gender is just behavior, clothes and personality. You can't become male, not even with hormones and surgery. So, try to accept that you are female and present yourself in the way that is comfortable for you." – Lucretia123 source [citation:04a28f0f-dda7-4047-95b6-a6b88f9d7c27] Because gender roles are socially constructed stereotypes, rejecting or embracing certain clothes, hobbies, or mannerisms does not alter your sex; it simply demonstrates your unique personality. Non-conformity—wearing what you like, pursuing any interest, refusing restrictive labels—is framed as the route to authenticity, not medical intervention.

Conclusion: Embrace Your Unchangeable Sex and Free Your Expression
The shared message is one of gentle clarity: your body’s reproductive blueprint is permanent, but the cultural costume of “masculine” or “feminine” is optional. Understanding that sex is rooted in gamete-based biology can relieve the pressure to medically alter yourself in order to feel legitimate. Instead, the path forward lies in compassionate self-acceptance and the freedom to express every facet of your personality without bowing to stereotypes. You are already whole; the rest is just choice.