[stanne]

Humanae Vitae - Encyclical Letter of His Holiness Paul VI on the regulation of birth, 25 July 1968.

People continue to ignore this piece of literature which does better from 1968 to describe the logic in the posted article, as well as many other present social phenomena.

[trisham]

You are so right:

http://www.vatican.va/holy_father/paul_vi/encyclicals/documents/hf_p-vi_enc_25071968_humanae-vitae_en.html