Guarantee of Medical Accuracy in Sex Education Act - Prohibits a federal agency from providing funds or assistance to an entity for the development of course material or the provision of instruction on human development and sexuality if such material or instruction will include medically inaccurate information. Directs such an agency to require a sufficient assurance that such material or instruction will not include medically inaccurate information.
Defines "medically inaccurate information" as information related to medical, psychiatric, psychological, empirical, or statistical statements that is unsupported or contradicted by peer-reviewed research by leading medical, psychological, psychiatric, and public health organizations and agencies.