So heterosexual, married couples without children and who ultimately don’t procreate aren’t really married either?
If they don’t intend to procreate then no they aren’t.
(In fact, the intent to not procreate is a valid reason to have a marriage declared invalid)
Can. 1101 §1. The internal consent of the mind is presumed to conform to the words and signs used in celebrating the marriage.
§2. If, however, either or both of the parties by a positive act of the will exclude marriage itself, some essential element of marriage, or some essential property of marriage, the party contracts invalidly.
Canon 1055 says;
Can. 1055 §1. The matrimonial covenant, by which a man and a woman establish between themselves a partnership of the whole of life and which is ordered by its nature to the good of the spouses and the procreation and education of offspring, has been raised by Christ the Lord to the dignity of a sacrament between the baptized.
Therefore, the procreation and education of offspring is an essential good of marriage.
The New Commentary on the Code of Canon Law has the following to say (page 1315):
Whether a particular marriage gives rise to children is, in some measure, beyond the control of the spouses. the failure to have children, whether because of the sterility of the parties or because of their conscious intention, does not in itself invalidate consent, but exclusion of the right to potentially conjugal acts by a positive act of the will is invalidating. Exclusion of marriage’s ordination to the procreation and education of offspring occurs when a spouse reserves to himself or herself the right to determine whether, when, and under what circumstances conjugal relations will be open to the procreation of children. Thus, the good of offspring is excluded when:
*]The right to acts per se apt for the generation of children is excluded absolutely;
*]The right to such acts is limited, even for a time;
*]The exclusion of the right, even for a time, is made a condition of marriage;
*]the exclusion of the right is implicit in the exclusion of children from the marriage;
*]the right to conjugal acts is limited to contraceptive acts only, or to conjugal acts during the "safe time."
The point is that homosexual partnerships simulating marriage cannot, by their very definition, have that procreative capability. Technology might allow a counterfeit, particularly between two female homosexuals, but it will only ever be a counterfeit.