Susan and I are trained "Our Whole Lives" (OWL) educators for ESUUC. We have taught classes for grades K-2, 4-6 (twice) and 7-9. We are trained for, but have not taught grades 10-12.
Our favorite safer sex advertising comes from the Swiss government: http://www.lovelife.ch/ (Click the little "e" in the top left for English).
These two posters were used on billboards in 2006.