I see this and more as another of the contraception effects. For almost all of human history, sexual relations were btwn men and women and resulted in the God-given natural result of children, and with the female giving birth which she is uniquely suited to do, almost always in marriage, which is to provide the stable, secure environment for relations and which children need, and with the mother being engaged in mothering, which she also is uniquely suited for, but in union with, and in support of her husband, who supports her.
And which often resulted in "unplanned" pregnancies (the only way to prevent this being to "plan" sexual relations) and having children one "could not afford," which along with interfering with the women's life, education and or career is one of the reasons women give for aborting children, and which would apply to preventing pregnancies.
But which overall usually meant that children learned going without things, even before all that is typical for kids today, and thus learned delayed gratification, and also how to relate to and or deal with other persons, and with retreat to one's room, which usually was shared, was to read a book.
Today, the average birth rate is 1.6 children (https://www.vox.com/23971366/declining-birth-rate-fertility-babies-children), and since that includes all ethnicities, then it would be less among while liberals, and the average age of a women's first birth being age 30 (https://www.ny1.com/nyc/all-boroughs/health/2022/07/26/median-age-for-new-moms-rises-to-30-in-u-s-), and are raised in an environment of an unprecedented high standard of living.
Meanwhile, with the contraception recourse also comes rampant fornication, and with results that contraception is supposed to prevent, that of fatherless children.
All of which on one hand can be linked to the rise of a culture of selfish, intolerant protest-prone children in "secular seminaries" of immersing them in the waters of wokeism, and with liberal men and women in power promoting such wokeducation and policies, and welfare, and punishing dissidents.
Female lawmakers lead the 120 members of Congress (https://campaignforchildren.org/news/press-release/female-lawmakers-lead-the-120-members-of-congress-who-put-children-first-new-scorecard-says) But "less than 7 percent of members of Congress are mothers with minor children." (https://pettersen.house.gov/news/documentsingle.aspx?DocumentID=258)
Meanwhile, with the contraception recourse also comes rampant fornication, and with results that contraception is supposed to prevent, that of fatherless children. Resulting in (besides one out of 3 pregnancies resulting in murder) about 1 in 4 US children being in an "officially" fatherless household, with about 80% of single-parent homes being led by single mothers (which is much due to welfare advantages) and with children from single-parent families being twice as likely to suffer from mental health and behavioral problems as those living with married parents, and thus more likely to be in state operated facilities. (https://americafirstpolicy.com/issues/issue-brief-fatherlessness-and-its-effects-on-american-society)
Now how much different would this be if a norm men and women saw the natural result of sexual relations, that of children, and larger families, learning to share, work, and develop the manner of enduring character such as that enabled them to fight WW2 on its terms, which we could not do today, aside from the decimation of industrial base?
All of which is an indirect result of the decline of strong Christian faith, failing the test of prosperity.
And note that this is not an attack on being single itself, as being chaste and single is a Biblical option, but my critique refers to a normative society.
*