Comment 229 by Tedilasllaves :

The Marxists and users of contraception are not following what the Catholic Church teaches. As far as I'm aware not a single 'ex cathedra' teaching of the Catholic Church has ever changed and this is what informed Catholics are talking about when they speak of Catholic teaching.

You do realise that the Pontifical commission on birth control produced a majority report which stated artificial birth control that was not intrinsically evil and that Catholic couples should be allowed to decide for themselves about the methods to be employed. According to the majority report, use of contraceptives should be regarded as an extension of the already accepted cycle method.

However, it was vetoed by the then pope Paul VI who accepted the minority report.