H.R. 2378, the Defining Male and Female Act of 2025, would establish federal legal definitions of sex-based terms in U.S. law. The bill adds definitions to the U.S. Code specifying that "male" and "female" refer to biological reproductive characteristics present at conception, with "male" defined by the biological capacity to produce sperm and "female" by the capacity to produce eggs. The legislation also defines related terms like "man," "woman," "boy," "girl," "mother," and "father" based on these biological definitions, and explicitly states that "gender identity" will not be recognized by the federal government as a replacement for sex in interpreting federal law. The bill applies to all federal agencies and their regulations, affecting how the federal government implements laws across all departments. No specific funding is allocated in the legislation, which was introduced on March 26, 2025, and referred to the House Judiciary Committee.
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