Heterosexual relationship decline data

Between 1970 and 2022, the U.S. crude marriage rate fell from about 10.6 marriages per 1,000 population to roughly 6.0. The drop is steeper for non-college Americans than for college Americans, steeper for Black Americans than for white Americans, and steeper for men than for women in absolute terms. Cherlin documents the inflection point in the 1970s, when the cultural meaning of marriage shifted from an expected adult passage to an optional achievement. The cliff is not a smooth decline; it's a structural break around 1975, followed by a long, class-stratified erosion. What the rate measures is not personal preference but coordination success. A marriage requires two consenting adults arriving at the same decision at the same time. When the rate halves, what halved is not desire—surveys show most adults still say they want to marry—but the conditions under which two desires can synchronize.

In 1960, U.S. women married, on average, at 20.3 and men at 22.8. In 2023, those figures are 28.6 and 30.2. The shift of roughly eight years is not "people getting more mature." It is the migration of marriage from cornerstone to capstone. People now expect to complete education, stabilize careers, accumulate savings, and resolve identity questions before pairing. Cherlin's frame is exact: marriage is no longer the platform on which adult life is built; it is the trophy awarded once adult life has been built. The eight extra years come out of the most fertile and most pair-bond-formative window of human biology. This timing mismatch is the single largest contributor to below-replacement fertility in wealthy societies.

Among adults born after 1980, the majority of first co-residential unions are cohabitations, not marriages. Roughly 70 percent of women who marry today cohabited first. Cohabitations dissolve at substantially higher rates than marriages: about half end within five years, compared to roughly a quarter of marriages. The shift is not neutral substitution. McLanahan's research shows that cohabitation, especially with children present, produces sharply more partnering churn—mothers cycling through multiple cohabiting partners over a decade. Children raised in this churn show measurable disadvantages across nearly every developmental outcome. The substitution is not marriage-by-another-name. It is a less stable, less binding arrangement that the legal and cultural environment has not figured out how to support or replace.

In 1960, about 5 percent of U.S. births were to unmarried mothers. The figure is now near 40 percent overall, above 70 percent among Black Americans, and above 60 percent among non-college whites. Edin's interviews with low-income mothers establish that this is not a values gap. The women want marriage, often desperately, and view marriage as sacred. What they reject is marrying men they consider too unreliable to be permanent partners—a category that, given male labor-market collapse in the bottom third, now includes most available men. They have children anyway because motherhood is a source of meaning and adulthood when other sources are inaccessible. The 40 percent figure is the residue of a coordination failure between low-income women's standards and low-income men's capacity.

Surveys consistently show declining sexual frequency among Americans under 35, with a particularly steep drop among men. The General Social Survey shows the share of men aged 18–29 reporting no sexual activity in the past year roughly tripling between 2008 and the early 2020s. This is not a healthier abstinence trend; it correlates with rising loneliness, depression, and disengagement from work and education. The sex recession is the leading edge of a connection recession. Where pair-bonding fails, casual sex does not fill the gap—it also contracts. The species behavior in absence of bonds is not promiscuity; it is withdrawal.

McLanahan's diverging-destinies model is the single most predictive frame for the current data. Among women with a four-year degree, marriage rates remain high, divorce rates have fallen back near 1970 levels, and nonmarital childbearing is rare. Among women without a degree, marriage has collapsed, cohabitation has proliferated, and most children are born outside stable unions. The same individual indicators that mark stability for the upper third—delayed childbearing, low divorce, high marriage—now move in opposite directions across classes. There is no longer a single American family system. There are two, and they are pulling apart.

Loneliness data is gendered. Women report higher loneliness in old age; men report sharply higher loneliness in young adulthood. Putnam's broader social-capital data shows that men's friendship networks have thinned faster than women's over the past four decades. The pair bond historically did more for men's social embeddedness than for women's—men relied on a wife to maintain extended social ties. With marriage delayed by eight years and skipped entirely by a growing minority, that social-maintenance function has vanished for many men in their twenties and thirties, with no replacement.

Total fertility rates have fallen below replacement (2.1) in nearly every wealthy society. The U.S. is now at roughly 1.6, South Korea below 0.8, Italy near 1.2. The fertility drop is downstream of the pair-bond drop. Most below-replacement fertility is not from women choosing one child instead of three; it is from women never partnering with someone they trust enough to have any children with. Edin's interviews show desired fertility well above actual fertility—a gap of roughly half a child per woman across the OECD. The data point is not "people don't want kids." It is "people cannot find the partners they would need to have the kids they want."

Women now earn roughly 60 percent of U.S. bachelor's degrees. The traditional pairing pattern—women marrying men with equal or higher education—runs out of supply at the upper end and runs out of demand at the lower end. The result is a structural mismatch: educated single women cannot find educated single men in equal numbers, and non-educated men cannot find women willing to pair down. Hypergamy norms have not adjusted as fast as the education ratio. The mismatch is largest in cities with the most concentrated education sorting. The data shows growing populations of unpartnered educated women and unpartnered non-educated men, often in the same metropolitan areas, failing to match across the educational line.

Divorce rates rose sharply through the 1970s, peaked around 1980, and have declined since—but the decline is almost entirely among college-educated couples. Non-college marriages still dissolve at rates near the 1980 peak. The overall lifetime divorce probability sits near 40 percent. The divorce data is often misread as good news ("divorce is falling"). What is falling is the number of people who marry; the conditional probability of dissolution remains high, and is class-stratified, like everything else in this section.

Hrdy and Dunbar both establish that human pair bonds historically operated inside a thick alloparental network. The dyad was never load-bearing alone. Contemporary couples are asked to do, in two people, what their grandparents did with twelve. The data shows this is not working: marriages with no proximate kin network dissolve at higher rates, and couples in geographically dispersed families report sharply lower satisfaction. The pair-bond decline data and the kin-network decline data are not two stories; they are one story measured at two scales.

The data is descriptive. It tells us the old system is broken and the new one is not stable. It does not tell us whether human pair bonding is in a temporary trough or a permanent decline; whether technology will route around it through artificial partners and chosen kin; or whether some unforeseen reconfiguration—a new institutional form, a new economic settlement—will reassemble the dyad on different foundations. Anyone projecting confidently past the data is doing politics, not analysis. What the data demands is humility about the diagnosis and seriousness about the costs already incurred: a generation of underformed bonds, undermade children, and unaccompanied adults.

Cherlin, Andrew J. The Marriage-Go-Round: The State of Marriage and the Family in America Today. New York: Knopf, 2009.

Cherlin, Andrew J. Labor's Love Lost: The Rise and Fall of the Working-Class Family in America. New York: Russell Sage Foundation, 2014.

McLanahan, Sara. "Diverging Destinies: How Children Are Faring Under the Second Demographic Transition." Demography 41, no. 4 (2004): 607–627.

McLanahan, Sara, and Christopher Jencks. "Was Moynihan Right? What Happens to the Children of Unmarried Mothers." Education Next 15, no. 2 (2015): 14–20.

Edin, Kathryn, and Maria Kefalas. Promises I Can Keep: Why Poor Women Put Motherhood Before Marriage. Berkeley: University of California Press, 2005.

Edin, Kathryn, and Timothy J. Nelson. Doing the Best I Can: Fatherhood in the Inner City. Berkeley: University of California Press, 2013.

Murray, Charles. Coming Apart: The State of White America, 1960–2010. New York: Crown Forum, 2012.

Putnam, Robert D. Our Kids: The American Dream in Crisis. New York: Simon and Schuster, 2015.

Hrdy, Sarah Blaffer. Mothers and Others: The Evolutionary Origins of Mutual Understanding. Cambridge, MA: Belknap Press, 2009.

Dunbar, Robin. Friends: Understanding the Power of Our Most Important Relationships. London: Little, Brown, 2021.

Wuthnow, Robert. Loose Connections: Joining Together in America's Fragmented Communities. Cambridge, MA: Harvard University Press, 1998.

Cherlin, Andrew J. "The Deinstitutionalization of American Marriage." Journal of Marriage and Family 66, no. 4 (2004): 848–861.