The first porn was not on film of any kind. The first porn items were ancient rock carving and drawings, in other words prehistory Art. Phallic symbols and fertilely rites were all the rage among the “cave men”. They worshiped the penis and the womb as the magically creators of life. Apparently porn was very popular with our ancient ancestors. It would be a better world today if the religions of today venerated cocks and cunts, but noooo, they are demonized instead.
From the ancient world thru the dark and middle ages sex needed to be controlled because of inheritance and lineage rights. You had to know if children were really your true biological heirs for a lot of wealth and prestige were at steak. For example, a Jew is only a Jew if the mother is Jewish. It’s pretty good proof when a baby is coming of a women who the mother is. The father, who knows Roman Catholic priest were forbidden to marry because the church got fed up with the wives of priest demanding church property. Sex was made evil and absentance a virtue to control this problem.
As the various religions were established, the existing social norms on sex were incorporated into the religionist theology. Secular concerns were given supernatural authority. Uncontrolled sex loss the secular concerns of inheritance and was forbidden by God Himself as Evil. Porn, being an arousal aide for sex, was condemned for social control with no less than God as the authority.
Porn was always popular but more so today because of the sexual and technological
revolutions, and the decline of religious fervor. Thank God.