The number of unmarried adults has increased significantly in recent decades, meaning that "many unmarried adults in their 20s are also trying to figure out how to manage their sex lives," the Los Angeles Times reports. A poll published earlier this year by the National Campaign To Prevent Teen and Unplanned Pregnancy that examines sexual behaviors and beliefs among 18-through 29-year-olds found that the age group had the highest rates of sexually transmitted infections and high levels of unintended pregnancies... 
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