A Mortal Sin On New Year's Eve 1930, the Roman Catholic Church officially banned any "artificial" means of birth control. Condoms, diaphragms and cervical caps were defined as artificial, since they blocked the natural journey of sperm during intercourse.
Why does the Catholic Church not allow birth control?
Regarding his frank 1930 pronouncement on birth control, “Casti Connubii,” Pope Pius XI declared that contraception was inherently evil and any spouse practicing any act of contraception “violates the law of God and nature” and was “stained by a great and mortal flaw.”Jul 9, 2018