This article has some direct comparisons between excerpts from Humanae vitae and real life developments in marriage, sex, contraception, etc., since 1968. For example,
'In section 17, Pope Paul made several predictions about the grave consequences that would inevitably result from an increasing reliance on contraception:
Responsible men can become more deeply convinced of the truth of the doctrine laid down by the Church on this issue if they reflect on the consequences of methods and plans for artificial birth control. Let them first consider how easily this course of action could open wide the way for marital infidelity
All other things being equal, its easy to see that convenient, widespread access to contraception has made it easier to commit adultery.
and a general lowering of moral standards....
As for coming up with examples testifying to the general lowering of moral standards in the last two generations, one scarcely knows where to begin."