The Catholic Church is unclear on many things, but it's stance on birth control is not one of them. It is difficult, if not impossible, to misinterpret a statement like: "Contraception is wrong". The church believes that preventing pregnancy in any way, with one notable exception, is a sin.
This is my blog, so I'm going to give my opinion. I think birth control is a scientific breakthrough, and one to be celebrated, not condemned.
(For the record, I am not talking about the rightness, or the wrongness, of sex. Assuming consent and adult-hood, I think that sex is, or should be, between the participants and their doctors alone. For the sake of the Catholicism argument, let's just assume the couple in question is indeed married. Assuming the otherwise is another conversation for another day).
I suspect the ban on contraception started long ago, when Catholics were being persecuted and our numbers were dwindling. What better way to build a group's numbers than to insist that it's members proliferate? Banning contraception would be one way to insure population growth. But the fact is, that is no longer the reality.
The reality today is that people are having sex, with no intention of (or desire for) creating a child. No one likes unwanted or un-cared for children, and no one likes abortion. Preventing a pregnancy - make it literally not happen - is an easy, inexpensive, logicial, and yes, responsible solution.
(Sidebar - this task that I've committed to is much harder than I anticipated it being!)