Various surveys have documented widespread support among US parents, students, teachers and health professionals for school-based comprehensive sexuality education. In many school districts, however, the sexuality education provided is minimal, incomplete or fragmented, and essential topics are often omitted or inaccurately presented. To help explain the discrepancy between support and accomplishment, this study develops a set of theory-based research hypotheses regarding the potential motivational roles of stakeholders' goals, emotions and personal agency belief patterns in explaining this lack of achievement. A series of exploratory interviews and focus groups with 36 California parents, adolescents and professionals was conducted. A modified grounded-theory approach was used to guide the collection and analysis of qualitative data, and the development of a theoretical framework anchored in Martin Ford's motivational systems theory. This framework suggests the complexity of the interacting factors involved, and provides a basis for specific hypotheses for further research. Potentially important goals, emotions and personal agency belief patterns are identified and discussed. (Contains 2 tables and 1 figure.)