The roots of the crisis are said by some to rest with the pivotal decision banning artificial contraception, which was published in the 1968 papal encyclical Humanae Vitae.
Väidetakse, et kriisi juured peituvad pöördelises kunstliku viljastamise keelus, mis avaldati aastal 1968 paavsti entsüklikaga „Humanae Vitae ”.