…But this is where the argument for traditional marriage begins to break down. It’s been quite a long time since the defining characteristic of marriage, from a societal standpoint, had anything to do with children. With the advent of modern techniques for contraception in the 20th century, it has become increasingly easy (and common) for marriage and children to be mutually exclusive.
As Catholics, we must understand this: Sterile sex is unnatural sex. When unnatural sex has become commonplace, as it has in a contraceptive culture, it becomes intellectually impossible to make significant distinctions between homosexual sex and contraceptive heterosexual sex. By removing openness to procreation as the fundamental defining characteristic of legitimate marital sexual intimacy, we have embraced any and all sexual relations that express emotional love as the sort of relations which are proper to marriage.
In a 2008 article, Hoover Institution research fellow and author Mary Eberstadt made note of this blurring of the lines from the perspective of the Anglican Church:
By giving benediction in 1930 to its married heterosexual members purposely seeking sterile sex, the Anglican Church lost, bit by bit, any authority to tell her other members—married or unmarried, homosexual or heterosexual—not to do the same. To put the point another way, once heterosexuals start claiming the right to act as homosexuals, it would not be long before homosexuals start claiming the rights of heterosexuals.
Thus in a bizarre but real sense did Lambeth’s attempt to show compassion to married heterosexuals inadvertently give rise to the modern gay-rights movement—and consequently, to the issues that have divided their church ever since. It is hard to believe that anyone seeking a similar change in Catholic teaching on the subject would want the Catholic Church to follow suit into the moral and theological confusion at the center of today’s Anglican Church—yet such is the purposeful ignorance of so many who oppose Rome on birth control that they refuse to connect these cautionary historical dots.