The number of teens in the U-S having sex is at a 25-year low, and the use of condoms among young people is slightly higher than in the last 11 years. That’s according to a new report by the Centers for Disease Control and Prevention. The study found that teens who waited until age 18 or 19 before having sex were more likely to use contraception the first time they had sex. Researchers suspect education about sex and pregnancy influenced that decision. The study was conducted, in part, to analyze the factors that influence teen childbearing.