Contact Congress about H.R. 2378: Defining Male and Female Act of 2025

HR 2378 would lock in biological definitions for male, female, and sex across every federal law and agency rule. Gender identity could not be used as a substitute for sex in any federal context. The change could reshape how civil rights protections, government records, and public programs handle sex-based categories.

Modern Action explains legislation in plain English, helps you choose whether to support, oppose, or ask for changes, and drafts a message tied to the bill, your stance, and the elected officials who can act on it.

Defining Male and Female Act of 2025 is a House bill in committee. The latest recorded action: Referred to the House Committee on the Judiciary.

Latest action on H.R. 2378: Referred to the House Committee on the Judiciary.

Who this affects: This bill would affect anyone whose rights, benefits, or legal status under federal law depend on sex-based categories. That includes transgender and nonbinary individuals whose lived gender differs from the bill's biological definitions, as well as intersex individuals whose biology does not fit neatly into either category. It also reaches federal agencies that currently interpret sex-related terms more broadly, and any person who interacts with federal programs that use sex-based classifications.

Why this matters: This bill would set a single, nationwide standard for how the federal government defines and applies sex-related terms. Because these definitions would sit in the part of law that governs interpretation of all federal statutes, their reach extends well beyond any single policy area. The practical effects on civil rights protections, government records, and public services could be significant and wide-ranging.

Key provisions in H.R. 2378

• Adds a new Section 9 to Chapter 1 of Title 1, U.S. Code — the rules that guide how every federal statute is interpreted.
• Defines male and female based on reproductive biology at conception: males are defined by sperm production, females by egg production.
• Defines sex as an immutable biological classification — either male or female — determined by the new section.
• Defines boy and girl as minors who are male or female; man and woman as adults who are male or female, based on the biological definitions.
• Defines mother as a female parent and father as a male parent.

How Modern Action helps you take action on H.R. 2378

You do not have to start with a blank letter. Modern Action turns the bill, your position, and the relevant congressional context into a message you can edit and send. The goal is to make contacting Congress clear, specific, and useful without forcing you to parse bill text or figure out the right office on your own.

Questions people ask about H.R. 2378

What is H.R. 2378?

HR 2378 would lock in biological definitions for male, female, and sex across every federal law and agency rule. Gender identity could not be used as a substitute for sex in any federal context. The change could reshape how civil rights protections, government records, and public programs handle sex-based categories.

How do I support or oppose H.R. 2378?

Choose support, oppose, or ask for changes on Modern Action. The action flow drafts the message for you and keeps the wording tied to this bill.

Who should I contact about H.R. 2378?

Modern Action uses your location to route the action to the congressional offices relevant to the bill and your representation.

Can Modern Action explain H.R. 2378 before I act?

Yes. Modern Action gives you a plain-English summary, current status, and action context before you send anything.