Humanae Vitae explains it all. It is based on natural law as well as. Biblical teaching
Four prophecies of Humanae Vitae:
Infidelity and moral decline
Lost Respect for Women
Abuse of Power
Unlimited Dominion
Humanae Vitae 25 years ago “prophesied” that marriages and society would suffer if the use of contraception became widespread.
https://www3.nd.edu/~afreddos/courses/264/popepaul.htm
Yep