From the website catholic.com:

Ignoring the mountain of evidence, some maintain that the Church considers the use of contraception a matter for each married couple to decide according to their "individual conscience." Yet, nothing could be further from the truth. The Church has always maintained the historic Christian teaching that deliberate acts of contraception are always gravely sinful, which means that it is mortally sinful if done with full knowledge and deliberate consent (CCC 1857). This teaching cannot be changed and has been taught by the Church infallibly.

There is no way to deny the fact that the Church has always and everywhere condemned artificial contraception. The matter has already been infallibly decided. The so-called "individual conscience" argument amounts to "individual disobedience."

Now I haven't a clue how legitimate this lot are. Could be a bunch of nutcases for all I know. But a Catholic who wants clarity on the matter and who googled like I just did would likely come up with this too. Sinful or not? Don't you think the Church, after all it's said down the years about contraception, owes its members clarity? It seems to me that leaving things vague and open to interpretation is the Church's evasive way of avoiding looking like the dinosaur ort really is.