“High school students are having less sexual intercourse. That’s what the studies say. But that doesn’t mean they’re having less sex. The language of young love and lust, and the actions behind it, are evolving. And the shift is not being adequately captured in national studies, experts say.” Sex? Sexual intercourse? Neither? Teens weigh in on evolving definitions — and habits. This article describes a lot of definitions of sex that I didn’t get in high school.