When I was a young man, the “Counterculture” informed me and all of my cohorts, both male and female, that marriage was “just a piece of paper” and that no such piece of paper could improve one’s relationship with the opposite sex. Marriage was an absurd irrelevancy, the product of an uncomprehending and pitifully unhip Past. Like so much about the Counterculture, that proved to be false. The notion was more about sending a message to straight society than getting facts right.
For whatever reason, that message has persisted in this culture. Marriage rates are either declining or people are getting married later, so data on marriage among those under the age of, say, 35, are far below what they used to be. In any case, young adults are postponing marriage till much later than previously and to some extent, aren’t marrying at all.