Defining SEX Act
The Heritage Foundation
A base definition of sex for state law. Pair it with the other bills on this page instead of inventing a second definition.
Resources
Start here
Sex definitions are the base text. Heritage’s Defining SEX Act and Independent Women’s definition act are nearly the same. Pick one base definition and reuse it in every other bill. Independent Women’s January 2025 Stand with Women Act is the all-in-one bill (definitions, single-sex spaces, and sex-based data). Their 2022 Women’s Bill of Rights was an earlier short version — for new drafting, use the 2025 models.
The Heritage Foundation
A base definition of sex for state law. Pair it with the other bills on this page instead of inventing a second definition.
Independent Women’s Voice / Independent Women’s Law Center (January 2025)
Independent Women’s standalone definition act. Near-duplicate of Heritage’s Defining SEX Act — pick one base and reuse it.
Independent Women’s Voice / Independent Women’s Law Center (January 2025)
The current omnibus: definitions, single-sex spaces, and sex-based data. Facility sections are also listed under bathrooms, shelters, and prisons.
Medicine
Models that limit puberty blockers, hormones, and surgeries for minors — plus related protections for detransitioners.
Do No Harm (January 2023)
Blocks puberty blockers, cross-sex hormones, and surgeries for minors; also covers school secrecy, public funding, liability insurance, and a private cause of action.
Do No Harm (November 28, 2023)
Informed consent, care, insurance, public reporting, birth-record restoration, and lawsuit provisions for people who detransition.
Family Research Council (April 2022)
A policy brief on banning puberty blockers, cross-sex hormones, and transition surgeries for minors. Useful background — not a full bill template you can introduce as-is.
Family Research Council (~2022)
Background on counseling bans that outlaw talk therapy for gender dysphoria or unwanted same-sex attraction, and on counseling-protection bills. Not a full bill template.
Enacted Arkansas law
Arkansas’s 2021 law that bans puberty blockers, cross-sex hormones, and gender-transition surgery for minors. Other states often use this enacted law as a working example.
Family Policy Alliance
Model language to ban puberty blockers, cross-sex hormones, and gender-transition surgery for people under 18, with liability for providers who violate it. Family Policy Alliance says versions of these protections are now law in 27 states. The full model bill text is not posted online — contact Family Policy Alliance for the drafting language, or contact us and we can help connect you.
Schools and parents
School rules on names, pronouns, and what parents get told — plus curriculum and classroom models.
The Heritage Foundation
Staff use the birth-certificate name and sex-based pronouns unless parents consent in writing; protects staff who refuse opposite-sex pronouns.
Florida (2022)
Florida’s 2022 parent-notice law. Schools must tell parents about changes in a student’s mental, emotional, or physical health or well-being. Districts may not keep secret policies that hide that from parents. It also limited classroom teaching on sexual orientation and gender identity in the early grades.
Florida (2023)
Follow-up to Parental Rights in Education. Bans classroom instruction on sexual orientation or gender identity from pre-K through grade 8 (with narrow exceptions). In grades 9–12, any such instruction must meet state age-appropriate standards. Also defines sex in the education code, sets rules on personal titles and pronouns, and tightens how schools handle contested library and classroom materials.
Florida State Board of Education (effective August 22, 2023)
Educator-conduct rule that puts the classroom limits into force for licensed teachers: no intentional SOGI classroom instruction in pre-K through grade 8 (except where statute requires it); grades 9–12 only if required by state standards or in an opt-out health lesson. Also ties educator discipline to sex-separated facilities and personal-title/pronoun rules. Implements HB 1069 for the classroom side.
Manhattan Institute (Christopher F. Rufo, February 7, 2023)
Curriculum, pronouns, and secret social transition: bars secret social transition, preferred names and pronouns, and gender instruction without parental consent; requires curriculum transparency. Think-tank text, not a statute.
Manhattan Institute (Rufo, Copland, Ketcham, December 1, 2021)
Broader school-board template: public posting of staff-training and student instructional materials, with optional scope covering sex, gender, and related topics. Companion to the February 2023 model.
Do No Harm (January 2023)
Public school transparency. Same PDF as the JUST FACTs Act.
The Heritage Foundation (January 6, 2025)
School-board policy on parental rights, safety, privacy, and respect for students in the district.
Independent Women’s Voice (2025)
Short 10-point school-board commitment: academic focus; no coercing kids to hide information from parents; sex-based sports, bathrooms, locker rooms, and overnight stays; parental consent for medical, social, and mental interventions and extracurriculars; no compelled speech.
Wisconsin Institute for Law & Liberty (WILL)
Downloadable board policies: parental notification and consent for names and pronouns (#32); staff use of student pronouns and conscience (#33); sex-separate restrooms and locker rooms (#42); K–12 athletics separated by sex (#46).
School Boards for Academic Excellence (SBAE, August 2024)
Compact district policy: biological sex definitions; parental notification for counseling about gender; legal name and sex on official records; names and pronouns tied to the official record unless an eligible student or parent authorizes otherwise; facilities and athletics by sex.
The Heritage Foundation
Raising a child consistent with sex is not abuse and is not grounds to remove a child or deny foster or adoptive placement.
Sports
Independent Women’s Voice / Independent Women’s Law Center (January 2025)
An Act to Protect Equal Athletic Opportunities for Women and Girls. Defines sex and reserves female athletic events for females.
Enacted Idaho law (2020)
This is the text most states have copied. Later “Save Girls’ Sports” and “Fairness in Women’s Sports” bills follow this approach.
Family Policy Alliance
A campaign to keep girls’ and women’s sports female-only. Family Policy Alliance says versions of these protections are law in many states. The full model bill text is not posted online — use their campaign page to contact them for the drafting language, or contact us and we can help connect you.
Single-sex spaces
Independent Women’s Voice / Independent Women’s Law Center (January 2025)
Sex-separates correctional facilities, juvenile detention, domestic-violence shelters, locker rooms, and school overnight trips, with single-occupancy alternatives.
Independent Women’s Voice / Independent Women’s Law Center (January 2025)
Shelter, school restroom, and prison and juvenile-detention sections in the omnibus PDF.
Alliance Defending Freedom (April 22, 2016)
A school-board policy, not a state statute. Sex-designates multi-user restrooms, locker rooms, and showers.
Records
The Heritage Foundation (June 2025)
Keeps sex on birth certificates and other vital and state records as male or female as recorded at birth, with narrow corrections only (clerical error, disorder of sex development, or restoring a record that was wrongly changed).
Independent Women’s Voice / Independent Women’s Law Center (January 2025)
Agencies and schools that collect sex data record each person as male or female as observed or clinically verified at birth.
Do No Harm (November 28, 2023)
Legal restoration and insurance sections. Same PDF as the medical card.
Do No Harm (January 2023)
Funding and insurance sections. Same PDF as the medical card.
Federal models
Educational federal models from Defense of Freedom Institute — sports, intimate facilities, sex definitions, parental rights, campus due process. Not state bill text. Listed here as study resources only.
Defense of Freedom Institute (May 2025)
Defines sex biologically; keeps males out of women’s sports and sex-separated facilities; protects parental rights; restores campus due process; bars agencies from rewriting Title IX by regulation. Draft text, not enacted law, and not a request that any legislature enact it.
Defense of Freedom Institute (December 2024)
Agency-level draft that addresses gender-identity rules and covers women’s sports, privacy, parental rights, speech, and due process. Not enacted law, and not a request that any agency adopt it.
Related reading on this site: puberty blockers, U.S. and World Progress, and subscribe.