The Supreme Court’s recent consideration of state laws governing participation in girls’ school sports has surfaced a familiar but unresolved problem in federal antidiscrimination law. Although these disputes have attracted significant social and political attention, the cases before the Court center on a narrower legal question. They ask how Title IX’s prohibition on discrimination on the basis of sex applies in school athletics, a context long organized around sex-separated teams.[i] The litigation thus exposes an unresolved tension within Title IX that Congress never fully resolved.
Title IX of the Education Amendments of 1972 provides that “[n]o person in the United States shall, on the basis of sex, be excluded from participation in, be denied the benefits of, or be subjected to discrimination under” federally funded education programs.[ii] At the same time, Congress and federal regulators, including the Department of Education, assumed that schools would continue to organize athletic teams by sex.[iii] Department of Education regulations expressly permit educational institutions to sponsor separate teams for males and females where selection is based on competitive skill or where the sport is a contact sport.[iv] Title IX, therefore, combines a broad nondiscrimination mandate with regulatory provisions that allow athletic programs to be structured by sex.
For much of the statute’s history, this arrangement generated little doctrinal friction. Sex separation in school sports was widely understood to reflect biological distinctions, and Title IX enforcement focused primarily on parity in funding, opportunities, and treatment between boys’ and girls’ programs.[v] More recent challenges, however, have required courts to confront whether Title IX’s accommodation of sex-separated teams can be reconciled with claims brought by transgender students seeking access to athletic programs consistent with their gender identity.[vi] The statute itself provides no explicit guidance on this question, leaving courts to reason from its text, structure, and existing precedent.
That uncertainty is evident in the Supreme Court’s consideration of state athletic eligibility laws. In cases such as West Virginia v. B.P.J. and Little v. Hecox, transgender students have challenged state statutes restricting participation in sex-separated school sports under both Title IX and the Equal Protection Clause.[vii] These disputes place pressure on a statutory scheme that prohibits discrimination on the basis of sex while simultaneously permitting sex-based athletic classifications, highlighting the absence of a coherent interpretive framework for competitive sports.
Arguments before the Court have frequently invoked Bostock v. Clayton County, in which the Court held that discrimination against transgender employees constitutes discrimination “because of sex” under Title VII.[viii] Bostock provides an important interpretive reference, but its relevance to Title IX remains contested.[ix] Title VII regulates employment relationships, while Title IX governs educational programs and expressly contemplates sex-separated athletics.[x] The structural differences between the two statutes complicate the assumption that statutory language must yield identical results across regulatory contexts. In particular, extending Bostock’s reasoning to Title IX without adjustment risks disregarding Department of Education regulations that permit schools to maintain separate athletic teams based on sex, as well as Congress’s expectation that such classifications would persist in competitive sports.[xi] If adopted, such an approach could treat restrictions on athletic participation based on transgender status as inherently discriminatory, substantially narrowing the scope of permissible sex-based classifications in school athletics.
The difficulty lies not only in defining “sex,” but in determining how antidiscrimination principles should be applied to athletic programs structured around categorical distinctions. Courts and litigants have approached the issue in different ways. One approach emphasizes physiological attributes historically associated with male and female athletes, treating sex-based classifications as a practical way to account for competitive differences and permitting eligibility rules to rely on sex as a general marker of athletic performance.[xii] Under this view, sex-separated teams are understood as consistent with Title IX so long as they reflect performance-based rationales rather than invidious exclusion.
A competing approach focuses on the categorical nature of exclusion itself, reasoning that rules barring participation based on sex classification function as group-based distinctions that trigger heightened scrutiny under antidiscrimination law.[xiii] From this perspective, the relevant inquiry is not whether sex classifications correlate with average performance differences, but whether categorical exclusions are consistent with Title IX’s prohibition on discrimination on the basis of sex. Title IX offers no clear framework for resolving the tension between these approaches. The statute neither specifies whether athletic eligibility rules must permit individualized assessment nor explains when reliance on sex classifications becomes incompatible with its nondiscrimination mandate.
That disagreement has also surfaced in public commentary surrounding the cases now before the Court. Kristen Waggoner of Alliance Defending Freedom, for example, cautioned that “it will be women and girls that suffer the most when biological distinctions are not recognized in the law when those distinctions matter.”[xiv] The statement illustrates how debates over Title IX’s application to athletics often turn on competing views about the role of sex-based classification within antidiscrimination law.
This unresolved structure has consequences beyond the specific disputes that prompted Supreme Court review. Despite extensive litigation and oral arguments before the Court, Title IX does not specify how its prohibition on sex discrimination applies to athletic programs organized by sex, leaving lower courts and educational institutions to navigate competing interpretations under federal law.
The Court’s forthcoming decision presents an opportunity to clarify how Title IX’s nondiscrimination mandate interacts with the longstanding regulatory framework governing school athletics. Any such clarification will require grappling with the statute’s dual commitments, which include eliminating sex-based discrimination while preserving sex-separated athletic programs that have historically structured competitive sports. Whether the Court ultimately grounds its analysis in statutory text, regulatory history, or constitutional analogy, resolving the relationship between sex, classification, and competition is essential to the coherent application of Title IX. Until that relationship is clarified, the statute will continue to operate with persistent uncertainty in its application.
[i] See 34 C.F.R. § 106.41(b) (authorizing sex-separated athletic teams based on competitive skill or contact sports); see also Clark v. Arizona Interscholastic Asso., 695 F.2d 1126, 1129–30 (9th Cir. 1982) (“When schools have offered separate teams for boys and girls, courts have generally approved prohibitions for girls’ participation on boys’ teams.”).
[ii] See 20 U.S.C. § 1681(a).
[iii] See Cong. Rsch. Serv., R48448, Gender and School Sports: Federal Action and Legal Challenges to State Laws 2 (2025).
[iv] See A Policy Interpretation: Title IX and Intercollegiate Athletics, U.S. Dep’t of Educ. (Dec. 11, 1979), https://www.ed.gov/about/offices/list/ocr/docs/t9interp.html [https://perma.cc/EZ54-5RW6].
[v] See Tiseme Zegeye, Evening the Field: Title IX’s Continuing Impact on Gender Equality in Sports, ACLU (Mar. 20, 2012), https://www.aclu.org/news/womens-rights/evening-field-title-ixs-continuing-impact-gender-equality [https://perma.cc/XZ6G-GXN9] (“Title IX’s mandate obliges schools to not only insure that girls and women have equal opportunities to participate in sports, but also requires that female and male sports are treated equally[.]”); see also What is Title IX?, WSF (Sep. 10, 2019), https://www.womenssportsfoundation.org/advocacy/what-is-title-ix/ [https://perma.cc/2SU9-S7BE] (“Title IX gives women athletes the right to equal opportunity in sports in educational institutions that receive federal funds, from elementary schools to colleges and universities.”).
[vi] See US Department of Education Announces 18 Title IX Investigations Related to Transgender Athletes – What Should Your School Do?, Fisher Phillips (Jan. 21, 2026), https://www.fisherphillips.com/en/news-insights/us-department-of-education-announces-18-title-ix-investigations-related-to-transgender-athletes.html [https://perma.cc/L5JW-RJP6] (“The Department of Education’s announcement of these 18 investigations follows . . . oral argument at the U.S. Supreme Court in . . . cases [challenging] state bans on transgender athletes playing on teams that align with their gender identity [under the Constitution] and Title IX.”).
[vii] See Supreme Court Concludes Oral Arguments in Historic Transgender Rights Hearing, Lambda Legal (Jan. 13, 2026), https://lambdalegal.org/newsroom/bpj_us_20250113_scotus-concludes-oral-arguments-in-historic-trans-rights-hearing/ [https://perma.cc/KCA6-YQ7R] (reporting that challengers argued the bans violate Equal Protection Clause and, as to West Virginia, Title IX).
[viii] See Chloe Peeples, The Broad Implications of the Bostock Decision on LGBTQ+ Employment, Geo. J. on Poverty L. & Pol’y (May 10, 2021), https://www.law.georgetown.edu/poverty-journal/blog/the-broad-implications-of-the-bostock-decision-on-lgbtq-employment/ [https://perma.cc/5APG-YYF2] (“Bostock held that discrimination against transgender and gay employees qualified as discrimination ‘because of sex’ and it is disparate treatment discrimination in violation of Title VII.”).
[ix] See Steven M. Richard, Ninth Circuit Holds that Title IX Bars Sexual Harassment Based on Perceived Sexual Orientation, Nixon Peabody (June 16, 2023), https://www.nixonpeabody.com/insights/alerts/2023/06/16/ninth-circuit-holds-that-title-ix-bars-sexual-harassment-based-on-perceived-sexual-orientation [https://perma.cc/MA6M-EFAY] (“Nationally, judges disagree on Bostock’s applicability to Title IX, at times with differences within the same court.”).
[x] See Emily Vaisa et al., Discrimination in Education: Do You Have a Title IX Claim, a Title VII Claim, or Can You Bring Both?, KJK (Apr. 22, 2024), https://studentdefense.kjk.com/2024/04/22/discrimination-in-education-do-you-have-a-title-ix-claim-a-title-vii-claim-or-can-you-bring-both/ [https://perma.cc/22M9-2CQE] (“While Title VII governs employment relationships; Title IX applies in education settings.”).
[xi] See 34 C.F.R. § 106.41(b); see also Cong. Rsch. Serv., IF12325, Title IX and Athletics: Legal Basics 1 (2025).
[xii] See Andrew Chung & John Kruzel, US Supreme Court Conservatives Lean Toward Allowing Transgender Sports Bans, Reuters (Jan. 14, 2026), https://www.reuters.com/legal/government/us-supreme-court-hears-challenge-transgender-sports-bans-2026-01-13/ [https://perma.cc/K7UZ-BRET] (noting that arguments focused on physical characteristics and competitive fairness are tied to biology); see also Cong. Rsch. Serv., R48448, Gender and School Sports: Federal Action and Legal Challenges to State Laws 10 (2025) (“According to DOJ, the state’s policy ‘forces girls to compete against boys–despite the real physiological differences between the sexes,’ which denies equal athletic opportunities to girls.”).
[xiii] See Melissa Quinn, Supreme Court to Step Into Long-Simmering Debate Over Transgender Athlete Bans, Cbs News (Jan. 13, 2026, 9:59 AM), https://www.cbsnews.com/news/supreme-court-transgender-athlete-bans-idaho-west-virginia/ [https://perma.cc/RC7A-9EER] (“[S]tates argue that their laws do not discriminate based on transgender status, and instead draw permissible distinctions between the sexes. West Virginia and Idaho officials say theirs bans’ sex-based classifications are allowed[.]”); see also Supreme Court Trans Athlete Bans: Human Rights vs Policy Fairness Clash, Impact Policies (Jan. 15, 2026), https://impactpolicies.org/news/751/supreme-court-trans-athlete-bans-human-rights-vs-policy-fairness-clash [https://perma.cc/EBR8-YQJ5] (“Lower federal courts invalidated . . . bans, deeming them discriminatory under Title IX and Equal Protection standards that trigger heightened scrutiny for sex-based classifications.”).
[xiv] See PBS NewsHour, A Look at the Legal and Political Fight Over Trans Athletes as Cases Reach Supreme Court, Youtube (Jan. 13, 2026), https://www.youtube.com/watch?v=YXEz25kG1hM [https://perma.cc/5A8R-2FDW].
