Almost everywhere, sexuality education programs have faced serious implementation challenges that diminish their reach and effectiveness. As a result, many programs never move beyond the pilot stage. Those that do too often suffer from common problems such as lack of specific information in the curriculum on contraception and HIV/STI prevention; inadequate teaching materials and training; a scattershot approach to providing specific information that undermines comprehensive student understanding; and a tendency to delay introduction of sexuality education until secondary school—too late for the majority of youth in many developing countries who have already dropped out (Rosen and Conly, 1998). .
