Is it not only recently that the Catholic Church forbade it?

No. But the recent publicity and advocacy given to this wretched vice have led to new statements of the permanent Catholic doctrine. This vice ruined pagan Rome, and Origen wrote against the pagan Celsus in the third century, “At least the more our people obey Christian doctrine, the more they love purity, abstaining from even lawful sex-pleasure that they may the more purely worship God. Christians marry as do others, and they have children; but they do not stifle their offspring. They are in bodies of flesh, but they do not live according to the flesh.” In the fourth century St. Augustine wrote, “Relations with one’s wife when conception is deliberately prevented are as unlawful and impure as the conduct of Onan who was slain.” St. Thomas Aquinas, in the thirteenth century, taught clearly the constant doctrine of the Christian religion that birth-control is a grave sin. He writes, “Next to murder, by which an actually existent human being is destroyed, we rank this sin by which the generation of a human being is prevented.” Contra Gent., Bk. III., c. 122. It is not a new law by any means.

Radio Replies Volume 1 by Rev. Dr. Leslie Rumble MSC and Rev. Charles Mortimer Carty