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119-s-1147119th Congress

Defining Male and Female Act of 2025

Sponsored By: Senator Marshall, Roger [R-KS]

Introduced

Summary

This bill would set immutable biological definitions of 'male' and 'female' for federal law. It would also specify that the Federal Government would not recognize 'gender identity' as a replacement for sex.

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  • Sets specific labels for families and age groups by biology. It defines 'mother', 'father', 'boy', 'girl', 'man', and 'woman' using the bill's biological terms.
  • Defines 'male' and 'female' for natural persons by reproductive function at conception, tying males to sperm production and females to egg production.
  • Makes these definitions the reference point for interpreting sex across federal statutes and agencies.

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Bill Overview

Analyzed Economic Effects

1 provisions identified: 0 benefits, 0 costs, 1 mixed.

New federal sex and gender definitions

If enacted, the bill would add specific federal definitions for sex and related words. The bill would tell agencies and courts to use these definitions when reading any Act of Congress, regulation, or agency rule. It would define boy as a minor male and girl as a minor female, and man and woman as adult male and female. It would define male and female for natural persons by biological sex at conception (male: produces sperm; female: produces eggs). The bill would say sex is an immutable biological classification and that gender identity shall not replace sex for federal purposes.

Sponsors & CoSponsors

Sponsor

Marshall, Roger [R-KS]

KS • R

Cosponsors

  • Sen. Cassidy, Bill [R-LA]

    LA • R

    Sponsored 3/26/2025

  • Sen. Sheehy, Tim [R-MT]

    MT • R

    Sponsored 3/26/2025

  • Sen. Hyde-Smith, Cindy [R-MS]

    MS • R

    Sponsored 3/26/2025

  • Sen. Ricketts, Pete [R-NE]

    NE • R

    Sponsored 3/26/2025

  • Sen. Risch, James E. [R-ID]

    ID • R

    Sponsored 4/4/2025

Roll Call Votes

No roll call votes available for this bill.

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