I want to thank Bill Lindsey for pointing me to something in that Australian study on child sexual abuse in the Catholic Church at https://www.rmit.edu.au/content/dam/rmit/documents/news/church-abuse/child-sex-abuse-and-the-catholic-church.pdf

The authors, Peter Cahill and Desmond Wilkinson, say that following Pope Paul VI's refusal to listen to the advice of the theological advisory board he commissioned on Catholic teaching on birth control, the Catholic church has not had a compelling sexual ethic. The condemnation of birth control in Paul VI's Humanae Vitae has not been "received" by lay Catholics, who have largely rejected the teaching. This has resulted, Cahill and Wilkinson think, in a total undermining of anything the Catholic magisterium wants to say about sexual ethics after Humanae Vitae.