In 1995, 49 percent of girls ages 15 to 19 said they had never had intercourse. But from 2006 to 2010, 57 percent of teenage girls reported never having sex.
The survey also found that of the girls who said they were sexually active, 60 percent of them reported using the most effective forms of contraception. That number is up from the mid-90s, when less than half were using the best.
Officials believe both trends are contributing to the continuing decline in the teen birth rate.
The most effective forms of birth control were the pill, patch, vaginal ring, IUD, arm implant and contraceptive shot. Using only condoms was deemed only moderately effective.
The report, which the CDC released on Thursday, is based on a survey of 2,300 girls ages 15 to 19.