HERBENICK: Our study tracks the declines, too, and extends the research because Jane and our larger team tracked sex behaviors in really detailed ways. ![]() Given that research in other parts of the world has already indicated decreases in partnered sex, what do your recent findings add to the picture? But Scientific American spoke with its first author Debby Herbenick, a professor at the Indiana University School of Public Health–Bloomington, and Tsung-chieh (Jane) Fu, a co-author of the paper and a research associate at the school, about underlying factors that might explain these changes. The study itself did not probe the reasons for this trend. These respondents to the confidential survey ranged in age from 14 to 49 years. The researchers obtained the self-reported information from the National Survey of Sexual Health and Behavior and used responses from 4,155 people in 2009 and 4,547 people in 2018. Between 20, the proportion of adolescents reporting no sexual activity, either alone or with partners, rose from 28.8 percent to 44.2 percent among young men and from 49.5 percent in 2009 to 74 percent among young women. The decreases “aren’t trivial,” as the authors wrote in the study, published on November 19 in Archives of Sexual Behavior. The findings show that adolescents report less solo masturbation as well. has added to the pile of evidence, showing declines from 2009 to 2018 in all forms of partnered sexual activity, including penile-vaginal intercourse, anal sex and partnered masturbation. ![]() A recent study evaluating what is happening in the U.S. The huge range of benefits is one reason researchers have become alarmed at declines in sexual activity around the world, from Japan to Europe to Australia. Human sexual activity affects cognitive function, health, happiness and overall quality of life-and, yes, there is also the matter of reproduction.
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