EWTN Catholic Q&A
How do you respond to this argument on contraception?
Question from Anon on 11-16-2013:

Some moral theologians have claimed:"Catholic teachings attribute too much importance to the physical structure of the sex act as opposed to higher-order values such as the good of the person or the good of the couple. On other moral questions,the Church does not attribute the same absolute importance to the physical act. The Church distinguishes between murder and self-defense, even though the physical act of taking a human life is the same in both instances."

Answer by Judie Brown on 11-18-2013:

Dear Anon

The statement that you have provided makes no sense at all. I have no idea what sort of moral theologians would make a statement like this but the Catholic teaching on contraception is perfectly clear: it is a moral evil whether or not the item in question can kill a preborn child.

Judie Brown