Three Federal Definitions of Sex Are in Play, and They Do Not Agree

On June 30 the Supreme Court decided West Virginia v. B.P.J. and Little v. Hecox, holding 6-3 that state laws restricting girls' and women's school teams to biological females violate neither Title IX nor the Equal Protection Clause. Justice Kavanaugh wrote for the Court, applying intermediate scrutiny and finding the states' interests in safety and competitive fairness substantially served by the classification. Justices Thomas and Gorsuch concurred separately. Justice Sotomayor, joined by Justices Kagan and Jackson, would have remanded for individualized findings. The holding permits exclusion; it does not require it, it does not reach facilities or medical care, and it leaves every other obligation a school owes its students where it found them.

Three weeks later the House Education and Workforce Committee advanced the Title IX Clarification Act of 2026, H.R. 8781, on a party-line 18-15 vote. The bill, introduced by Rep. Arrington on May 13 and referred to that committee, amends section 901 of the Education Amendments of 1972 to provide that sex "refers to an individual's biologically determined sex, as either male or female," and then defines each term by gamete: a female is an individual who naturally has, had, will have, or would have, but for a congenital anomaly, historical accident, or intentional or unintentional disruption, the reproductive system that at some point produces the large gamete. Male is the mirror image. That is the whole bill. It says nothing about athletics, facilities, housing, or gender identity. It adds a dictionary and stops.

The executive branch has been answering the same question on a different theory since January 2025, when an order directed that government identification documents reflect sex at conception and the State Department stopped processing marker changes and withdrew the X option. That policy has been enforceable since the Supreme Court stayed the district court's preliminary injunction on November 6, 2025, and the First Circuit dismissed the ensuing appeal as moot and vacated the injunction on June 5, 2026, without reaching the merits. Meanwhile Kansas, Montana, North Dakota, and Tennessee have written gamete-based definitions into their own codes, reaching records, facilities, and athletics. One word, four sovereigns, three formulations.

Bostock v. Clayton County never defined sex. It presumed a definition and asked a but-for question about what it means to act because of sex, which is why the B.P.J. majority could distinguish it without disturbing it: employment and scholastic athletics are different contexts, and the antecedent question of who counts as female was not what Bostock resolved. That antecedent question has been left to the political branches for fifty years, filled in the meantime by agency guidance that reversed with each administration. Putting the definition in the statute is the correct structural answer. A term that changes meaning when the Department of Education changes hands is not a term Congress can be said to have enacted.

The difficulty is that the three formulations now in play are not paraphrases of one another. Sex at conception is a claim about an embryo. The gamete test is a claim about reproductive function, extended by counterfactual to cover people whose bodies never performed it. The state statutes generally speak of a reproductive system designed to produce one gamete or the other, which is a claim about apparent purpose. For the overwhelming majority of people all three return the same answer. For the small population where they diverge — differences of sexual development, congenital conditions, surgical history — they return different answers, and it is precisely that population that generates the administrative record and the litigation.

The counterfactual clause is worth reading twice, because it is a drafting problem inside a position this desk otherwise thinks is right. A definition that turns on what a body would have produced but for an anomaly, an accident, or a disruption cannot be applied by looking. Someone has to determine the counterfactual, and the bill names no one: no agency, no procedure, no record, no standard of proof. The stated purpose of legislating a definition is to remove discretion from officials who have been exercising it inconsistently. A counterfactual definition does not remove that discretion. It relocates it, to whichever registrar, athletic director, or Title IX coordinator has to decide what a given student's reproductive system would have done.

The opposition's strongest argument is not the rhetorical one. Rep. Scott, the committee's ranking member, said the bill would narrow existing civil rights law by writing transgender students out of Title IX's protections; the National Education Association said it would substantially narrow those protections; the Human Rights Campaign said Title IX is not about reducing children to their reproductive functions; Rep. Takano called it the Bully Empowerment Act. Strip the framing and a real structural point remains. A definition placed at section 901 operates everywhere the defined term appears in the statute — harassment complaints, housing assignments, discipline, recordkeeping, and remedies — not only in the athletics context the Supreme Court just addressed. The bill's silence about those areas is not a limitation on its reach. It is the mechanism of its reach.

Chairman Walberg's answer is that no one is left unprotected, because the bill mentions no group at all and only states what male and female mean. That is accurate, and it is also the same observation the other side is making. Defining a term once, generally, is exactly what makes the change consequential and exactly what makes it modest: a student excluded from a team retains every protection against harassment and every procedural right the statute affords, and simultaneously every provision keyed to sex now resolves according to a definition that did not previously appear in the text. Both descriptions are true. The disagreement is about whether that is a repair or a demolition, and that is a question about values, which is the sort of question a legislature is built to resolve and a court is not.

Which is the answer. Congress defining a term in a statute Congress wrote is the ordinary constitutional path, and it is more legitimate than the alternating guidance documents that have governed this area since 2016 — including when the guidance ran in the direction this desk prefers. Those who dislike the definition have the remedy the design contemplates, which is a vote, and they may well win it: the bill cleared committee on a party-line count with no Senate companion, which is not the profile of legislation about to become law. The point is that the definitional question is finally being litigated in the forum where it belongs.

The near-term procedural markers are the House floor and the Senate's arithmetic. A party-line committee vote and the absence of a companion bill make enactment this Congress unlikely, and the operative law for the next year therefore remains what it was on July 1: B.P.J. permits state exclusion policies, four state codes define the terms, the identification-document policy is enforceable, and Title IX itself still contains no definition of sex at all. Expect further state enactments in the winter sessions, and expect the definitional language in them to keep varying, because there is no model text that all four existing statutes share.

The exposure that is live right now is internal and documentary. An institution operating in more than one state is already subject to more than one definition, and most have never checked whether their own materials agree with each other: athletics eligibility, housing assignment, single-sex facilities, scholarship criteria, federal data reporting, and equal-opportunity statements were each drafted at a different time by different offices under different guidance. Counsel advising such an institution should consider inventorying where the term appears before deciding what it should say, because the reputational and contractual questions arrive ahead of the legal one. Accreditors, insurers, and athletic conferences price definitional ambiguity long before a court resolves it, and an institution that can state what it means and why is in a materially stronger position than one whose handbook says three things.

Bennet's regulatory-intelligence desk follows definitional fights of this kind, where the operative change is a word rather than a rule, and where the compliance cost lands in documents nobody has reread in six years.