There are two issues as I understand. First there's abortion and the concern that some contraceptives can induce abortion (for example, by making the womb so toxic that a conceived fetus dies). And of course you have things like the morning-after pill that is used as contraception but by design try to abort a fetus.
The other issue has to do with natural law. Catholics in particular subscribe to the idea that you should use things in the way God designed them to be used. (There's more to the philosophy, of course; this is just the bare-bones.) Sex is designed for the purpose of procreation, so if you have sex but use contraception you're using something in a way it can't possibly be used to procreate. So contraception basically sets you up as more important than God - he designed sex to be used one way, but you're using it another way. That's viewed as a sin.
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branchandroot
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Date: 2012-02-15 03:25 am (UTC)The other issue has to do with natural law. Catholics in particular subscribe to the idea that you should use things in the way God designed them to be used. (There's more to the philosophy, of course; this is just the bare-bones.) Sex is designed for the purpose of procreation, so if you have sex but use contraception you're using something in a way it can't possibly be used to procreate. So contraception basically sets you up as more important than God - he designed sex to be used one way, but you're using it another way. That's viewed as a sin.