Why Are Fewer Young Adults Having Casual Sex?

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.