Finer and his co-author Jesse Philbin, also of Guttmacher, used nationally representative data from the National Survey of Family Growth to track teens' sexual histories over time. Those rates were similar to the numbers seen in teens initiating sex after age Christopher Futcher Despite periodic media scares, young teens are remarkably unlikely to be sexually active, new research finds. The top reason not to have sex with both females and males were ranked separately in the study. As of , the most recent year data were available, 68 per every 1, teens experienced a pregnancy. Previous studies of young-adult sexual behavior have found a correlation with sex education, among other factors. Based on the year trend, a new study based on Centers for Disease Control and Prevention CDC data, has shown that the number of high-school teens having sex has gone down dramatically. A year later, 95 percent of those teens had taken up contraceptive use. Low rates of sexual activity among young adolescents have been the norm for decades, study researchers said. Stay up to date with our daily newsletter Related Stories. All rights reserved. Another alarming discovery was that of the few young adolescents who reported having sex, many or most did not do so voluntarily. The researchers found that 0. Similarly, 1. A report released in found that teen pregnancies peaked in and declined 42 percent over the next 18 years.