“Now, since the family and human society at large spring from marriage, these men will on no account allow matrimony to be the subject of the jurisdiction of the Church. Nay, they endeavor to deprive it of all holiness, and so bring it within the contracted sphere of those rights which, having been instituted by man, are ruled and administered by the civil jurisprudence of the community. Wherefore it necessarily follows that they attribute all power over marriage to civil rulers, and allow none whatever to the Church; and, when the Church exercises any such power, they think that she acts either by favor of the civil authority or to its injury. Now is the time, they say, for the heads of the State to vindicate their rights unflinchingly, and to do their best to settle all that relates to marriage according as to them seems good.”
Pope Leo XIII, 1880
He warned about the civil authorities defining marriage 130+ years ago. To the state in the modern era, marriage can only be what judges, pols, or the voting majority think it can be at any one time, and that’s the bottom line.
Freegards
My own Catholic ancestors came to the USA from the Rheinpfalz Palatinate area of German in around 1871, fleeing from Bismarck's Kulturkampf. At that time, as I remember the history, the Popes condemned civil marriage (as was instituted by Bismarck) precisely because it was a radical redefiniton of marriage.
And considering the almost-universal acceptance of altered, contraceptive sex amongst the so-called heterosexuals, it seems as if nobody in prnciple or in practice actually rejects unnatural sex and unnatural marriage.
Only a very few "heteros" have marriages that are even natural, let alone sacramental. And grace builds on nature.