Fifth- and eighth graders in the District are pretty well-versed in emotional-health issues but have a lot to learn about the human body, according to results from the city’s (and the nation’s) first-ever standardized test on health, physical education and sex ed, reports the Washington Post. High school students, meanwhile, correctly answered an average of three out of four questions about sexuality and reproduction — but knew far less about how to locate health information and assistance. Overall, city students correctly answered an average of 62 percent of questions about nutrition, wellness, disease prevention and sex education…