A nineteenth-century humorist once warned that a bigger problem than knowing little is “to know so many things that ain’t so.” Well, Americans know “many things that ain’t so” about cohabitation and marriage.

A new Pew Research Center study shows Americans both cohabitate (“live with an unmarried partner”) and find cohabitation acceptable more than before. But other research shows this is unwise. Here is what the Pew Research Center found.

More young adults have cohabited than have married. Pew’s analysis in the summer of 2019 of the National Survey of Family Growth found that, for the first time ever, the percentage of American adults aged 18-44 who have ever cohabited with a partner (59 percent) exceeded the percentage of those who have ever married (50 percent).

It should be noted, however, that the current living arrangements of adults of all ages still show a strong preference for marriage: 53 percent of American adults are currently married, while only 7 percent of adults are currently cohabiting (although cohabitation has risen from only 3 percent in 1995). These findings may either reflect that many people cohabit first and then marry, or that cohabiting relationships are less stable and thus much shorter than marriages.