US teens having less sex, drugs This seems to use the longer time span. comparing from the 90's to 2007.
Teen Sexual Activity Increases, Contraceptive Use Decreases This one is comparing from 2005 to 2007.
Sexual Behaviors that Contribute to Unintended Pregnancy and Sexually Transmitted Diseases, Including HIV InfectionThe gains that were claimed from 1991 to 2007 were all made from 1991 to 2003. From somewhere between 2003 and 2005 things stopped improving and then have either remained fairly constant or gotten worse until 2007. Can someone tell me when "comprehensive sex education" started getting pushed in public schools?
During 19912007, significant linear decreases occurred in the percentage of students who ever had sexual intercourse (54.1%47.8%), who had sexual intercourse with four or more persons during their lifetime (18.7%14.9%), and who were currently sexually active (37.5%35.0%). The percentage of students who had sexual intercourse for the first time before age 13 years decreased during 19912005 (10.2%6.2%) and then did not change significantly during 20052007 (6.2%7.1%). The percentage of sexually active students who used a condom at last sexual intercourse increased during 19912003 (46.2%63.0%) and then did not change significantly during 20032007 (63.0%61.5%). The percentage of students who drank alcohol or used drugs before last sexual intercourse increased during 19912001 (21.625.6) and then decreased during 20012007 (25.6%22.5%). The percentage of students who were taught in school about AIDS or HIV infection increased during 19911997 (83.3%91.5%) and then decreased during 19972007 (91.5%89.5%). During 20052007, no significant changes occurred in any of these sexual behavior variables.(emphasis added)