The purpose of this research was to conduct a preliminary evaluation of the Abstinence and Contraception Education Storehouse (ACES), a digital, classroom-based resource designed to supplement existing sex education curricula with highly interactive materials such as video clips, multimedia polls and quizzes, and audiovisual demonstrations. Three hundred thirty-five students aged 14 to 19 were randomly assigned to an ACES-based (treatment) or a standard (control) sex education curriculum. Data were collected at the onset of the intervention and 3 months after the completion of the intervention. Preliminary results were highly encouraging, with ACES participants who were sexually initiated at baseline reporting (at the 3-month follow-up) significant reductions in the number of times they had sex in the past 4 weeks. Both sexually initiated and non–sexually initiated youth who experienced the ACES curriculum also demonstrated greater intent to abstain from the sex during the follow-up period than did those in the control group.