Americans are having less sex — and researchers want to know why

Americans are having less sex, whether they’re teenagers or in their 40s.

One of the most comprehensive sex studies to date — the National Survey of Sexual Health and Behavior — found evidence of declines in all types of partnered sexual activity in the U.S. Over the course of the study from 2009 to 2018, those surveyed reported declines in penile-vaginal intercourse, anal sex and partnered masturbation.