contraception

hysteria

And Ideologues without MDs. There are a few things you want to tell priests but would be too embarassed to, so I will here.
The family planning rhythym method that catholics say should be the only valid form of birth control because it is 'natural planning' does not work all the time. It is not foolproof either in avoiding unwanted pregnancies. This method is based on women figuring out when they ovulate and then when the ideal times in relation thereto are for having or not having opportunity for an egg to actually get fertilized. Women use tools like thermometers - very sophistocated, and can sometime read their discharge.
Men are not expected to know that cycles are not always lock step in cync with a daily calendar and this prediction method is far from foolproof. Cycles vary with stresses, stress hormones, hormonal fluxuations caused by a variety of features, and dietary and health reasons. Irregular cycles are very common. http://women.webmd.com/tc/missed-or-irregular-periods-topic-overview
They get more common with increased diabetis risks and have something to do with metabolic changes that large changes in weight occur. So the kids now that are fighting juvenile diabetis have more incidents of irregular periods.
The over the counter contraceptives prevent pregnancies, in some cases much better than one could read one's body for a 'natural planning' rhythym method if one is sexually active. Of course, abstinence is the only sure fire foolproof way not to get pregnant, unless you are the Virgin Mary.
That is why it is knee jerk jerky to just rant against contraceptives in my humble view. In a perfect world no one would have sex until they married the right person and stayed married. We don't live in a perfect world and people are far from perfect, and public policy has to account for all the fallible creatures out there that make a country.