Christ is the head of the corpus mysticum, which includes all men from the beginning of the world to its end. He is not the president of a special-interest club.
Some people fifty years ago even hoped that the new freedoms, and technological controls, would stabilize marriage itself.
The 1968 papal encyclical Humanae Vitae, which also reaches its 50th anniversary this year, went on to become widely despised across the decades precisely for predicting otherwise – precisely for insisting that the revolution would hurt romance and family, and end up licensing predatory men and malignant governments.