In Humanae Vitae, Pope Paul VI warned of four results if the widespread use of contraceptives was accepted.

• General Lowering of Moral Standards: Michael Brendan Dougherty and Pascal-Emmanuel Gobry noted in Business Insider: "As George Akerloff wrote in Slate over a decade ago, 'By making the birth of the child the physical choice of the mother, the sexual revolution has made marriage and child support a social choice of the father.' Instead of two parents being responsible for the children they conceive, an expectation that was held up by social norms and by the law, we now take it for granted that neither parent is necessarily responsible for their children. Men are now considered to be fulfilling their duties merely by paying court-ordered child-support. That's a pretty dramatic lowering of standards for 'fatherhood.'"

• Rise in Infidelity and Illegitimacy: In 1960, 5.3% of all births in America were to unmarried women. By 2010, it was 40.8%. In 1960 married families made up almost three-quarters of all households; but by the census of 2010 they accounted for just 48 percent of them.

• Objectification of Women: Paul VI warned that contraception would reduce women to objects used to satisfy men.

• Tyranny: Paul VI warned that contraception would lead to government coercion in reproductive matters. Tyrannical governments favor contraception: The fewer people you have, the easier they are to control. And genocide is very messy and makes for unfavorable legacy, but contraception is fairly clean and looks smart. The federal government of the United States validated this in the 2010's by enacting laws forcing insurance plans to cover contraception.