Modifies provisions relating to the biological definition of male and female
HB1053 creates a new section in Missouri law called the “Defining SEX Act” and supplies statutory definitions for terms such as boy, girl, man, woman, father, mother, male, female, and sex. The bill defines male and female in biological terms tied to reproductive anatomy and functions, and defines sex as an individual’s biological sex, either male or female. It also states that, unless context clearly indicates otherwise, the word “gender” in existing state law, administrative rules, or guidelines should be read as a synonym for “sex” when referring to males, females, or natural differences between them.
The bill further provides that “gender” should not be treated as a synonym for “gender identity,” “experienced gender,” “gender expression,” or “gender role,” and that “gender identity,” if used in state law, administrative rules, or guidelines, should not be considered a substitute for “sex” or “gender.” It also includes a provision stating that individuals born with a medically verifiable disorder or difference in sex development are entitled to relevant legal protections and accommodations under the federal Americans with Disabilities Act.
If enacted, HB1053 would affect how Missouri statutes, administrative rules, and guidelines interpret sex- and gender-related terms by imposing a biological definition of male and female and by limiting the use of “gender” as a proxy for gender identity. The bill could influence the application of existing laws in areas where sex-based distinctions matter, including education, corrections, health, civil rights, and other state programs that use gendered terminology. It also explicitly references ADA protections for individuals with differences in sex development, preserving those federal accommodations within the bill’s framework.
No committee transcripts or recorded votes are provided, so there is no direct evidence of debate or formal support/opposition in the available record. Based on the bill’s text and caption, the measure appears to be framed as a definitional clarification rather than a programmatic policy change, but it addresses a politically sensitive subject and is likely to draw strong views from both supporters of sex-based legal definitions and opponents concerned about transgender and gender-identity implications. The absence of recorded legislative action in the provided materials means the bill’s practical reception cannot be determined from the record here.
The main point of contention is the bill’s treatment of “gender” and “gender identity.” Supporters would likely view the measure as clarifying that state law should use biological sex-based definitions, while opponents would likely argue that it narrows or excludes recognition of transgender, nonbinary, and gender-diverse identities in state law and policy. Another potential area of dispute is the bill’s effect on existing administrative rules and guidelines, since it directs how terms should be interpreted across preexisting state law. The ADA carveout for differences in sex development may reduce concern for some advocates, but it does not address broader objections about the bill’s impact on gender identity protections.