The researchers found that, through the early 2000s, sexual risk behaviors declined among U.S. high school students, but progress subsequently stalled. From 1991 to 2001 there was a decrease in the proportion of U.S. high school students who had ever had sex (54 to 46 percent) or had had multiple partners (four or more; 19 to 14 percent); there was an increase in the proportion of students who used a condom last time they had sex (from 46 percent in 1991 to 63 percent in 2003). These proportions stabilized and were 47, 15, and 60 percent, respectively, in 2011. There was also a decrease in the proportion of students who had had sex within the preceding three months, from 38 percent in 1991 to 34 percent in 2011.
"Protecting the health of young people and accelerating progress in HIV prevention in this population will require building upon these and other efforts in homes, schools, and communities across the nation," the authors write. "Only by intensifying our collective efforts will we be able to achieve our shared goal of an AIDS-free generation."