In this Aug. 29, 2013 file photo, students walk through the halls during an open house for incoming freshman and transfer students at a high school in Philadelphia. A new government survey released Thursday, June 9, 2016 finds a surprising drop in the proportion of high schools kids who are having sex. The survey found 41 percent said they had ever had sex, after it had been about 47 percent from a decade. (AP Photo/Matt Slocum)