From the article:
This is all background to how I found myself spewing “Casuistry! Casuistry!” at my computer screen the other night. I, like I’m sure many of you, have been kind of befuddled about this whole birth control thing, and I don’t just mean the obvious point that I cannot for the life of me figure out why people who resolutely oppose abortion would oppose what has to be the easiest way to prevent abortion, nor do I mean the political aspect, which has been thoroughly and thoughtfully covered on this site already. I mean specifically why Natural Family Planning (NFP) is A-OK, but hormonal and barrier birth control isn’t, since NFP lets you have sex without getting pregnant, and, according to some, is actually just as or even more effective. (I know that people really believe in this, because I have some Catholic Facebook friends who proudly post all the time about how their children are planned, thanks to NFP. Anecdata FTW.)
Read more at Persephone Magazine.