A recent study released by the Centers for Disease Control and Prevention shows the most frequent reason teenagers give for abstaining from sex is that the behavior goes against their religion or morals, Baptist Press reports. Among the 57 percent of girls and 58 percent of boys ages 15-19 who said they had never had sex, 41 percent of girls and 31 percent of boys chose "against religion or morals" as their main reason for not being sexually active. (The least-chosen option was "don't want to get a sexually transmitted disease.") Researchers also found that the rate of teenagers having sex has declined slightly from the last report, which was released in 2002; however, the percent of sexually active teen females has decreased dramatically since 1988 -- down from 51 percent to 43 percent. Valerie Huber, executive director of the National Abstinence Education Association, said the study showed the abstinence movement and message were "not only resonating, but also making a difference in the lives of youth."