The authorization of the Personal Responsibility Education Program (PREP) represents a significant legislative shift in how social policy in the United States implements school-based sexual health education to address concerns for youth health. In contrast to its abstinence-based predecessors, this federally funded program provides a more comprehensive approach to sex education that includes content on contraception, is evidence-based, and emphasizes diversity and service to vulnerable populations. Yet, despite these improvements to how sex education policy facilitates the healthy development of youth, the design and implementation of PREP do not provide substantial support of lesbian, bisexual, and gay (LGB) populations. This paper applies a family impact analysis framework to further explore this policy limitation and demonstrates how PREP perpetuates the heteronormative legacy of sex education in a way that continues to marginalize and harm LGB families.