Among young women, drinking less alcohol, & in men declines in drinking frequency, an increase in computer gaming, & the growing percentage who coreside with their parents, all contribute to the decline in casual sex

Why Are Fewer Young Adults Having Casual Sex? Scott J. South, Lei Lei.  Socius: Sociological Research for a Dynamic World, March 1, 2021. https://doi.org/10.1177/2378023121996854

Abstract: Fewer young adults are engaging in casual sexual intercourse now than in the past, but the reasons for this decline are unknown. The authors use data from the 2007 through 2017 waves of the Panel Study of Income Dynamics Transition into Adulthood Supplement to quantify some of the proximate sources of the decline in the likelihood that unpartnered young adults ages 18 to 23 have recently had sexual intercourse. Among young women, the decline in the frequency of drinking alcohol explains about one quarter of the drop in the propensity to have casual sex. Among young men, declines in drinking frequency, an increase in computer gaming, and the growing percentage who coreside with their parents all contribute significantly to the decline in casual sex. The authors find no evidence that trends in young adults’ economic circumstances, internet use, or television watching explain the recent decline in casual sexual activity.

Keywords: casual sex, young adults, emerging adulthood

Discussion and Conclusion

Adolescents and young adults are increasingly less likely to have sexual intercourse outside of a romantic relationship, but the causes of this decline in casual sex have not been rigorously evaluated. We use data from the PSID-TAS to quantify the sources of the decrease in young adult casual sexual activity between 2007 and 2017. We find that about one quarter of the drop in young women’s propensity to have casual sex is attributable to a decline in their frequency of drinking alcohol. Of the various sources of the decline in sexual activity considered in this analysis, the decline in alcohol consumption is the only factor that explains a significant portion of the decline in young women’s probability of engaging in casual sex.

A somewhat different story emerges for young men. As with young women, a decline in the frequency of drinking alcohol is an important source of young men’s diminished likelihood of having casual sex. But unlike for young women, among young men increases in the frequency of playing computer games and in the tendency to reside in the parental home also play important roles. Although both young women and young men play computer games more frequently now than in the past, gaming inhibits only young men’s casual sex behavior. The factors hypothesized to explain the decline in casual sexual intercourse explain a greater portion of the decline in young men’s than in young women’s propensity to engage in casual sex.

We find no evidence that some other transformations in the lives of emerging young adults can explain the decline in their casual sexual activity. Trends in young adults’ financial insecurity, including their student debt load, do not appear to underlie their change in casual sexual activity. Nor does an increase in time spent watching television. And among young women the increase in the use of the Internet appears to actually suppress what would otherwise have been a larger drop in the propensity to engage in sex with someone who is not a romantic partner.

We acknowledge that our findings raise questions as to what factors are driving changes in these proximate sources of the decline in young adult casual sexual activity. Further research is needed to identify the causes of trends in young adult alcohol consumption, computer gaming, and parental coresidence. Although changes in each behavior may have unique determinants, it is possible that some hard-to-quantify change in the young adult cultural zeitgeist is driving changes in these proximate determinants of casual sexual activity, as well as trends in casual sex. Growing individualism and reduced sociability might lead to less partying (and hence less drinking), more computer gaming, and less autonomous living, while also diminishing the desire for sexual intercourse—at least the type of casual encounters captured in this analysis. Causation could also run in the reverse direction if a diminished desire for casual sex leads youth to party, and drink, less frequently and to play more computer games, perhaps all the while living in the proverbial parents’ basement. Quantifying these potentially distal sources of change in young adults’ causal sexual activity is likely to be difficult, so qualitative studies may have much to offer here.

Future research might also profit by redressing some of the limitations of this analysis. The small sample size makes it difficult to detect significant associations or subgroup differences. Our measure of casual sexual activity is rather crude and could both undercount and overcount the nonromantic sexual encounters considered to be casual sex. The measure is also insensitive to heterogeneity in the types of these encounters. Trends in, and determinants of, one-time sex with strangers might differ substantially from sexual encounters between friends or former romantic partners and from encounters that one or both participants hope will lead to a more serious romantic relationship. College “hookups” might be a unique subtype of casual sexual encounters driven by a distinct set of factors (Allison 2016; England and Ronen 2015).

We note as well that our analysis leaves unexplained a substantial portion of the decline in young adults’ casual sexual behavior, particularly among young women. Trends in the hypothesized mediating factors included in this analysis explain more than half of the decline in young men’s odds of engaging in casual sex but account for only about one quarter of the decline in young women’s probability of having a nonromantic sexual encounter. Further research is needed to identify additional causes of the decline in casual sexual activity among young adults. Perhaps the intensifying concern with interpersonal sexual violence and sexual coercion as exemplified in the #MeToo movement has begun inhibiting presumably voluntary casual sexual encounters between young women and men. The impact of this and other broad cultural shifts will also likely be difficult to measure but may well require consideration in order to develop a comprehensive assessment of the decline in young adults’ casual sexual activity.