Beyond X&Y
@beyondxandy.bsky.social
🧬 Biomed experts mobilizing scientists to fight transphobia through education 🏳️⚧️
🌐 beyondxandy.org
✉️ info@beyondxandy.org
🌐 beyondxandy.org
✉️ info@beyondxandy.org
Pinned
Beyond X&Y
@beyondxandy.bsky.social
· Sep 23
It's the scientific community's duty to fight misinformation, bioessentialism, and eugenics
That's why we're launching Beyond X&Y, an educational campaign combating the rise of unscientific political propaganda used to attack trans and intersex people
Subscribe to our newsletter at beyondxandy.org
That's why we're launching Beyond X&Y, an educational campaign combating the rise of unscientific political propaganda used to attack trans and intersex people
Subscribe to our newsletter at beyondxandy.org
Are you a biomedical expert who wants to help fight for trans rights and evidence based medicine?
Check out this thorough, extremely helpful guide on how to submit official comments to defend gender affirming care:
Check out this thorough, extremely helpful guide on how to submit official comments to defend gender affirming care:
CTA Defend Trans Kids: If you're a clinician, a parent, a trans adult, or just someone who cares, I wrote a guide on how to submit effective comments opposing the federal ban on gender-affirming care for minors.
Deadline 2/17/26
🔗 www.patreon.com/posts/149210... 🔗
Deadline 2/17/26
🔗 www.patreon.com/posts/149210... 🔗
January 29, 2026 at 4:30 PM
Are you a biomedical expert who wants to help fight for trans rights and evidence based medicine?
Check out this thorough, extremely helpful guide on how to submit official comments to defend gender affirming care:
Check out this thorough, extremely helpful guide on how to submit official comments to defend gender affirming care:
Reposted by Beyond X&Y
Biology is so cool!!!
I fully used to believe that "man flu" was simply due to patriarchy - that women sucked it up because they had to keep being moms/caregivers, while men were just being whiny
Then I personally experienced it myself after starting T. It's so real!!
I fully used to believe that "man flu" was simply due to patriarchy - that women sucked it up because they had to keep being moms/caregivers, while men were just being whiny
Then I personally experienced it myself after starting T. It's so real!!
www.nature.com/articles/s41...
Lol - the true mark of being a man is that you get man flu apparently 😅
en.wikipedia.org/wiki/Man_flu
Lol - the true mark of being a man is that you get man flu apparently 😅
en.wikipedia.org/wiki/Man_flu
Immune system adaptation during gender-affirming testosterone treatment - Nature
Examination of immunological changes in transgender individuals undergoing gender-affirming testosterone treatment reveals sex hormone-regulated pathways in humans and explains sex-divergent responses...
www.nature.com
January 29, 2026 at 4:22 PM
Biology is so cool!!!
I fully used to believe that "man flu" was simply due to patriarchy - that women sucked it up because they had to keep being moms/caregivers, while men were just being whiny
Then I personally experienced it myself after starting T. It's so real!!
I fully used to believe that "man flu" was simply due to patriarchy - that women sucked it up because they had to keep being moms/caregivers, while men were just being whiny
Then I personally experienced it myself after starting T. It's so real!!
Reposted by Beyond X&Y
🚨 Requesting help:
I am looking for an agent who can facilitate more speaking gigs, podcast appearances, and interviews with journalists
I want to more widely share my story and expertise as a trans geneticist who understands the reality and complexity of "biological sex" 🏳️⚧️🧬
Please signal boost?
I am looking for an agent who can facilitate more speaking gigs, podcast appearances, and interviews with journalists
I want to more widely share my story and expertise as a trans geneticist who understands the reality and complexity of "biological sex" 🏳️⚧️🧬
Please signal boost?
January 28, 2026 at 9:03 PM
🚨 Requesting help:
I am looking for an agent who can facilitate more speaking gigs, podcast appearances, and interviews with journalists
I want to more widely share my story and expertise as a trans geneticist who understands the reality and complexity of "biological sex" 🏳️⚧️🧬
Please signal boost?
I am looking for an agent who can facilitate more speaking gigs, podcast appearances, and interviews with journalists
I want to more widely share my story and expertise as a trans geneticist who understands the reality and complexity of "biological sex" 🏳️⚧️🧬
Please signal boost?
Reposted by Beyond X&Y
I also welcome any direct connections people may have to podcasts who need a guest, or organizations who need a speaker (it's about that time to start planning for Trans Day of Visibility!)
If you have questions or ideas, DM me or email me at jey (at) beyondxandy (dot) org
@beyondxandy.bsky.social
If you have questions or ideas, DM me or email me at jey (at) beyondxandy (dot) org
@beyondxandy.bsky.social
January 28, 2026 at 9:09 PM
I also welcome any direct connections people may have to podcasts who need a guest, or organizations who need a speaker (it's about that time to start planning for Trans Day of Visibility!)
If you have questions or ideas, DM me or email me at jey (at) beyondxandy (dot) org
@beyondxandy.bsky.social
If you have questions or ideas, DM me or email me at jey (at) beyondxandy (dot) org
@beyondxandy.bsky.social
Abortion access, gender affirming care, and access to Prep and AIDS medications are all issues of bodily autonomy and founded in legitimate medical research
But that doesn't matter to fascists. Enforcing strict gender binaries and destroying science maintains power among a few cishet wealthy men
But that doesn't matter to fascists. Enforcing strict gender binaries and destroying science maintains power among a few cishet wealthy men
Vance just announced that “organizations receiving U.S. non-military funding will not be able to work on abortion, DEI and issues related to transgender people, even if that work is done with other funding sources”.
Another egregious decision by the administration that will cause great harm.
Another egregious decision by the administration that will cause great harm.
Vance announces aid restrictions for groups that promote diversity, transgender policies abroad
The move expands a longstanding Republican policy that restricted U.S. funding for organizations working on or promoting abortion overseas.
www.yahoo.com
January 23, 2026 at 11:17 PM
Abortion access, gender affirming care, and access to Prep and AIDS medications are all issues of bodily autonomy and founded in legitimate medical research
But that doesn't matter to fascists. Enforcing strict gender binaries and destroying science maintains power among a few cishet wealthy men
But that doesn't matter to fascists. Enforcing strict gender binaries and destroying science maintains power among a few cishet wealthy men
Reposted by Beyond X&Y
This is why it's important to vocally fight for trans rights - it works!
Big win 🎉🏳️⚧️
Big win 🎉🏳️⚧️
HUGE NEWS for trans people: We have the latest minibus, including the bill to fund the Department of Health and Human Services and it looks like there are no restrictions on gender-affirming care for transgender people.
docs.house.gov/billsthiswee...
docs.house.gov/billsthiswee...
docs.house.gov
January 20, 2026 at 4:39 PM
This is why it's important to vocally fight for trans rights - it works!
Big win 🎉🏳️⚧️
Big win 🎉🏳️⚧️
This is why it's important to vocally fight for trans rights - it works!
Big win 🎉🏳️⚧️
Big win 🎉🏳️⚧️
HUGE NEWS for trans people: We have the latest minibus, including the bill to fund the Department of Health and Human Services and it looks like there are no restrictions on gender-affirming care for transgender people.
docs.house.gov/billsthiswee...
docs.house.gov/billsthiswee...
docs.house.gov
January 20, 2026 at 4:39 PM
This is why it's important to vocally fight for trans rights - it works!
Big win 🎉🏳️⚧️
Big win 🎉🏳️⚧️
Reposted by Beyond X&Y
Want to help our cause? If you see any
1. Anti-trans news story lying about "trusting the science" that "biological sex" is binary
2. Scientific resources explaining the complexity of sex and gender
3. Good faith questions that could use a trans geneticist's brain
Send it via DM or tagging us! 🏳️⚧️🧬
1. Anti-trans news story lying about "trusting the science" that "biological sex" is binary
2. Scientific resources explaining the complexity of sex and gender
3. Good faith questions that could use a trans geneticist's brain
Send it via DM or tagging us! 🏳️⚧️🧬
January 8, 2026 at 3:08 PM
Want to help our cause? If you see any
1. Anti-trans news story lying about "trusting the science" that "biological sex" is binary
2. Scientific resources explaining the complexity of sex and gender
3. Good faith questions that could use a trans geneticist's brain
Send it via DM or tagging us! 🏳️⚧️🧬
1. Anti-trans news story lying about "trusting the science" that "biological sex" is binary
2. Scientific resources explaining the complexity of sex and gender
3. Good faith questions that could use a trans geneticist's brain
Send it via DM or tagging us! 🏳️⚧️🧬
Reposted by Beyond X&Y
Makes me feel insane to live in a world that's persecuting trans folk while simultaneously doing big billboards advertising gender affirming care to cis people???
January 17, 2026 at 5:35 PM
Makes me feel insane to live in a world that's persecuting trans folk while simultaneously doing big billboards advertising gender affirming care to cis people???
Reposted by Beyond X&Y
"Biological sex" is theological sex. Religion cannot act openly in the UK as it can in the USA.
Also the project and the tactics come from the USA.
screedvault.neocities.org/post/2025042...
Also the project and the tactics come from the USA.
screedvault.neocities.org/post/2025042...
Defining legal sex, the Supreme Court failed to address vital wording in the Equality Act 2010
TLDR:
screedvault.neocities.org
January 16, 2026 at 9:09 AM
"Biological sex" is theological sex. Religion cannot act openly in the UK as it can in the USA.
Also the project and the tactics come from the USA.
screedvault.neocities.org/post/2025042...
Also the project and the tactics come from the USA.
screedvault.neocities.org/post/2025042...
Reposted by Beyond X&Y
In 2022 I started tracking changes in how news outlets were describing trans people, and set up a bot to record every article pushed to the Google News index based on a handful of search phrases, including “biological sex” in both the US and UK. The amount in 2023 alone was absolutely staggering.
January 16, 2026 at 12:27 AM
In 2022 I started tracking changes in how news outlets were describing trans people, and set up a bot to record every article pushed to the Google News index based on a handful of search phrases, including “biological sex” in both the US and UK. The amount in 2023 alone was absolutely staggering.
Reposted by Beyond X&Y
There are many terms to refer to a person’s sex: sex, birth sex, natal sex — and more contentiously, assigned sex at birth and biological sex.
Here's our expanded guidance for journalists interested in reporting accurately about trans and intersex people:
www.transjournalists.org/why-biologic...
Here's our expanded guidance for journalists interested in reporting accurately about trans and intersex people:
www.transjournalists.org/why-biologic...
Why “biological sex” may not mean what you think
There are a lot of terms to refer to a person’s sex: sex, birth sex, natal sex — and more contentiously, assigned sex at birth and biological sex.
The nuances and differences aren’t always important....
www.transjournalists.org
January 14, 2026 at 5:51 PM
There are many terms to refer to a person’s sex: sex, birth sex, natal sex — and more contentiously, assigned sex at birth and biological sex.
Here's our expanded guidance for journalists interested in reporting accurately about trans and intersex people:
www.transjournalists.org/why-biologic...
Here's our expanded guidance for journalists interested in reporting accurately about trans and intersex people:
www.transjournalists.org/why-biologic...
Reposted by Beyond X&Y
Scientists reject a binary view of human sex at NIH symposium
They say complexities of human sex require more inclusive definitions, and research data need to reflect biological complexity
They say complexities of human sex require more inclusive definitions, and research data need to reflect biological complexity
Scientists reject a binary view of human sex at NIH symposium
Chemical & Engineering News (C&EN): Keeping you up to date with the chemistry news that matters most. Published by the American Chemical Society.
cen.acs.org
January 12, 2026 at 12:50 AM
Scientists reject a binary view of human sex at NIH symposium
They say complexities of human sex require more inclusive definitions, and research data need to reflect biological complexity
They say complexities of human sex require more inclusive definitions, and research data need to reflect biological complexity
Reposted by Beyond X&Y
since it's behind a paywall now, I wanted to share this graph from "How Trump 2.0 is slashing NIH-backed research — in charts" (Nature, April 2025). Say it with me: the anti-trans/LGBTQ+ movement is an anti-science movement:
[article sans figs can be read here: web.archive.org/web/20250501... ]
[article sans figs can be read here: web.archive.org/web/20250501... ]
January 12, 2026 at 6:45 PM
since it's behind a paywall now, I wanted to share this graph from "How Trump 2.0 is slashing NIH-backed research — in charts" (Nature, April 2025). Say it with me: the anti-trans/LGBTQ+ movement is an anti-science movement:
[article sans figs can be read here: web.archive.org/web/20250501... ]
[article sans figs can be read here: web.archive.org/web/20250501... ]
Reposted by Beyond X&Y
“Plato does not agree with the narrative that there are two biological sexes and that everyone should be heterosexual. So it is controversial. But that's the whole point of including him in the syllabus.”
— Martin Peterson, Texas A&M
@texasaaup.bsky.social
@texasaft.org
@tamu-aaup.bsky.social
— Martin Peterson, Texas A&M
@texasaaup.bsky.social
@texasaft.org
@tamu-aaup.bsky.social
January 9, 2026 at 2:55 PM
“Plato does not agree with the narrative that there are two biological sexes and that everyone should be heterosexual. So it is controversial. But that's the whole point of including him in the syllabus.”
— Martin Peterson, Texas A&M
@texasaaup.bsky.social
@texasaft.org
@tamu-aaup.bsky.social
— Martin Peterson, Texas A&M
@texasaaup.bsky.social
@texasaft.org
@tamu-aaup.bsky.social
Want to help our cause? If you see any
1. Anti-trans news story lying about "trusting the science" that "biological sex" is binary
2. Scientific resources explaining the complexity of sex and gender
3. Good faith questions that could use a trans geneticist's brain
Send it via DM or tagging us! 🏳️⚧️🧬
1. Anti-trans news story lying about "trusting the science" that "biological sex" is binary
2. Scientific resources explaining the complexity of sex and gender
3. Good faith questions that could use a trans geneticist's brain
Send it via DM or tagging us! 🏳️⚧️🧬
January 8, 2026 at 3:08 PM
Want to help our cause? If you see any
1. Anti-trans news story lying about "trusting the science" that "biological sex" is binary
2. Scientific resources explaining the complexity of sex and gender
3. Good faith questions that could use a trans geneticist's brain
Send it via DM or tagging us! 🏳️⚧️🧬
1. Anti-trans news story lying about "trusting the science" that "biological sex" is binary
2. Scientific resources explaining the complexity of sex and gender
3. Good faith questions that could use a trans geneticist's brain
Send it via DM or tagging us! 🏳️⚧️🧬
Reposted by Beyond X&Y
🧵 Big News:
Today was my last day at work. I resigned to completely dedicate my time to trans activism as long as it's financial feasible
I'll be writing a book debunking anti-trans attacks that falsely claim to be founded in "biology" and making educational resources at @beyondxandy.bsky.social
Today was my last day at work. I resigned to completely dedicate my time to trans activism as long as it's financial feasible
I'll be writing a book debunking anti-trans attacks that falsely claim to be founded in "biology" and making educational resources at @beyondxandy.bsky.social
January 2, 2026 at 11:43 PM
🧵 Big News:
Today was my last day at work. I resigned to completely dedicate my time to trans activism as long as it's financial feasible
I'll be writing a book debunking anti-trans attacks that falsely claim to be founded in "biology" and making educational resources at @beyondxandy.bsky.social
Today was my last day at work. I resigned to completely dedicate my time to trans activism as long as it's financial feasible
I'll be writing a book debunking anti-trans attacks that falsely claim to be founded in "biology" and making educational resources at @beyondxandy.bsky.social
Reposted by Beyond X&Y
@rikiwilchins.bsky.social 2026 Jan 2 AP: HRC files EEOC complaint on behalf of 4 fed employees against Office of Personnel Management policy banning coverage of “chemical & surgical modification" of sex for all federal employees, saying it constitutes sex-based discrimination.
Federal employees file complaint against Trump administration's ban on gender-affirming care
The Trump administration faces a legal complaint from government employees over a new policy eliminating coverage for gender-affirming care in federal health insurance programs.
apnews.com
January 2, 2026 at 11:11 AM
@rikiwilchins.bsky.social 2026 Jan 2 AP: HRC files EEOC complaint on behalf of 4 fed employees against Office of Personnel Management policy banning coverage of “chemical & surgical modification" of sex for all federal employees, saying it constitutes sex-based discrimination.
Reposted by Beyond X&Y
A coalition of 19 states and DC have filed a lawsuit challenging the Kennedy declaration seeking to ban gender affirming care for trans youth by fiat by creating a federal "standard of care" based on pure pseudoscience.
ag.ny.gov/press-releas...
ag.ny.gov/press-releas...
Attorney General James Leads Lawsuit Challenging Federal Attack on Gender-Affirming Care
NEW YORK – New York Attorney General Letitia James today led a coalition of 18 other states and the District of Columbia in filing a lawsuit to stop the U.S
ag.ny.gov
December 24, 2025 at 4:01 AM
A coalition of 19 states and DC have filed a lawsuit challenging the Kennedy declaration seeking to ban gender affirming care for trans youth by fiat by creating a federal "standard of care" based on pure pseudoscience.
ag.ny.gov/press-releas...
ag.ny.gov/press-releas...
Reposted by Beyond X&Y
The FDA prioritized attacking trans chest binders, which pose little risk, while allowing most pharmacogenomic DTC tests to market without being labeled as medical devices
This is why biotech isn't fighting this government. They'll make more money with lax regulations
This is why biotech isn't fighting this government. They'll make more money with lax regulations
23 Dec 2025 @rikiwilchins.bsky.social -- GenderBender, 1 of 11 companies FDA is trying to force to register chest binders as "medical devices," fires back: "Chest binders aren't a medical device in the same way that scissors used to give someone a gender-affirming haircut aren't a medical device."
Chest binder vendors respond to 'absurd' FDA warning letter: 'Clearly discrimination'
The FDA warned companies selling chest binders to register their products as medical devices. Here's how they're responding.
www.advocate.com
December 23, 2025 at 4:29 PM
The FDA prioritized attacking trans chest binders, which pose little risk, while allowing most pharmacogenomic DTC tests to market without being labeled as medical devices
This is why biotech isn't fighting this government. They'll make more money with lax regulations
This is why biotech isn't fighting this government. They'll make more money with lax regulations
Reposted by Beyond X&Y
Mushroom evolutionary biologist here.
We’re well aware of the fact that sex and gender isn’t a binary. Happy to talk about the fungus with 28,000 distinct sexual identities anytime.
Trans rights are human rights! 🏳️⚧️
We’re well aware of the fact that sex and gender isn’t a binary. Happy to talk about the fungus with 28,000 distinct sexual identities anytime.
Trans rights are human rights! 🏳️⚧️
December 22, 2025 at 4:09 PM
Mushroom evolutionary biologist here.
We’re well aware of the fact that sex and gender isn’t a binary. Happy to talk about the fungus with 28,000 distinct sexual identities anytime.
Trans rights are human rights! 🏳️⚧️
We’re well aware of the fact that sex and gender isn’t a binary. Happy to talk about the fungus with 28,000 distinct sexual identities anytime.
Trans rights are human rights! 🏳️⚧️
Reposted by Beyond X&Y
“All evolutionary biologists know that variation itself is life’s only irreducible essence”—Gould
Evolutionary biology is the study of how complicated and diverse life can be; the field has its jerks, but a good evolutionary biologist learns pretty fast that life doesn’t like boundaries or binaries
Evolutionary biology is the study of how complicated and diverse life can be; the field has its jerks, but a good evolutionary biologist learns pretty fast that life doesn’t like boundaries or binaries
Hey, fellow evolutionary biologists:
If you support trans rights, like, comment, or repost this. I want to show that transphobes like Richard Dawkins are a loud minority that does not represent our community
If you support trans rights, like, comment, or repost this. I want to show that transphobes like Richard Dawkins are a loud minority that does not represent our community
And that’s a follow.
Actually I do have a question if you have a sec.
Without exception the most transphobic group of scientists I’ve run into online are evolutionary biologists. Every single one of them has expressed the same opinion: transness cannot be anything other than social contagion. Why?
Actually I do have a question if you have a sec.
Without exception the most transphobic group of scientists I’ve run into online are evolutionary biologists. Every single one of them has expressed the same opinion: transness cannot be anything other than social contagion. Why?
December 22, 2025 at 5:32 PM
“All evolutionary biologists know that variation itself is life’s only irreducible essence”—Gould
Evolutionary biology is the study of how complicated and diverse life can be; the field has its jerks, but a good evolutionary biologist learns pretty fast that life doesn’t like boundaries or binaries
Evolutionary biology is the study of how complicated and diverse life can be; the field has its jerks, but a good evolutionary biologist learns pretty fast that life doesn’t like boundaries or binaries
Reposted by Beyond X&Y
I consider myself a biological anthropologist who sometimes has to engage with evolutionary biologists.
In EB, too often the conclusions are about how biology determines culture. In BA, we learn that culture & biology are interrelated, affecting each other but not determining (that’s too narrow).
In EB, too often the conclusions are about how biology determines culture. In BA, we learn that culture & biology are interrelated, affecting each other but not determining (that’s too narrow).
Hey, fellow evolutionary biologists:
If you support trans rights, like, comment, or repost this. I want to show that transphobes like Richard Dawkins are a loud minority that does not represent our community
If you support trans rights, like, comment, or repost this. I want to show that transphobes like Richard Dawkins are a loud minority that does not represent our community
And that’s a follow.
Actually I do have a question if you have a sec.
Without exception the most transphobic group of scientists I’ve run into online are evolutionary biologists. Every single one of them has expressed the same opinion: transness cannot be anything other than social contagion. Why?
Actually I do have a question if you have a sec.
Without exception the most transphobic group of scientists I’ve run into online are evolutionary biologists. Every single one of them has expressed the same opinion: transness cannot be anything other than social contagion. Why?
December 22, 2025 at 5:41 PM
I consider myself a biological anthropologist who sometimes has to engage with evolutionary biologists.
In EB, too often the conclusions are about how biology determines culture. In BA, we learn that culture & biology are interrelated, affecting each other but not determining (that’s too narrow).
In EB, too often the conclusions are about how biology determines culture. In BA, we learn that culture & biology are interrelated, affecting each other but not determining (that’s too narrow).
Reposted by Beyond X&Y
My training was very firmly in an evolution oriented EEB dept. As a visibly GNC queer, I have actually found EEB spaces to be a more welcoming home than neuroscience. Working on animal sexual behavior from an EEB perspective really highlights the sheer diversity of ways that sex can be organized.
Hey, fellow evolutionary biologists:
If you support trans rights, like, comment, or repost this. I want to show that transphobes like Richard Dawkins are a loud minority that does not represent our community
If you support trans rights, like, comment, or repost this. I want to show that transphobes like Richard Dawkins are a loud minority that does not represent our community
And that’s a follow.
Actually I do have a question if you have a sec.
Without exception the most transphobic group of scientists I’ve run into online are evolutionary biologists. Every single one of them has expressed the same opinion: transness cannot be anything other than social contagion. Why?
Actually I do have a question if you have a sec.
Without exception the most transphobic group of scientists I’ve run into online are evolutionary biologists. Every single one of them has expressed the same opinion: transness cannot be anything other than social contagion. Why?
December 22, 2025 at 7:27 PM
My training was very firmly in an evolution oriented EEB dept. As a visibly GNC queer, I have actually found EEB spaces to be a more welcoming home than neuroscience. Working on animal sexual behavior from an EEB perspective really highlights the sheer diversity of ways that sex can be organized.
Reposted by Beyond X&Y
Rather excellent thread
Let’s be very clear here. This is exactly why it was exceptionally unwise of the Supreme Court to wade into this space using ‘biological sex’ as a defining concept, because as soon as you talk to actual biologists the simple binary unravels. Not a stable basis for law.
Let’s be very clear here. This is exactly why it was exceptionally unwise of the Supreme Court to wade into this space using ‘biological sex’ as a defining concept, because as soon as you talk to actual biologists the simple binary unravels. Not a stable basis for law.
Hey, fellow evolutionary biologists:
If you support trans rights, like, comment, or repost this. I want to show that transphobes like Richard Dawkins are a loud minority that does not represent our community
If you support trans rights, like, comment, or repost this. I want to show that transphobes like Richard Dawkins are a loud minority that does not represent our community
And that’s a follow.
Actually I do have a question if you have a sec.
Without exception the most transphobic group of scientists I’ve run into online are evolutionary biologists. Every single one of them has expressed the same opinion: transness cannot be anything other than social contagion. Why?
Actually I do have a question if you have a sec.
Without exception the most transphobic group of scientists I’ve run into online are evolutionary biologists. Every single one of them has expressed the same opinion: transness cannot be anything other than social contagion. Why?
December 22, 2025 at 8:17 PM
Rather excellent thread
Let’s be very clear here. This is exactly why it was exceptionally unwise of the Supreme Court to wade into this space using ‘biological sex’ as a defining concept, because as soon as you talk to actual biologists the simple binary unravels. Not a stable basis for law.
Let’s be very clear here. This is exactly why it was exceptionally unwise of the Supreme Court to wade into this space using ‘biological sex’ as a defining concept, because as soon as you talk to actual biologists the simple binary unravels. Not a stable basis for law.