Reedtome, read
this. Also, from the Catechism, read this:
2370 Periodic continence, that is, the methods of birth regulation based on self-observation and the use of infertile periods, is in conformity with the objective criteria of morality.158 These methods respect the bodies of the spouses, encourage tenderness between them, and favor the education of an authentic freedom. In contrast, “every action which, whether in anticipation of the conjugal act, or in its accomplishment, or in the development of its natural consequences, proposes, whether as an end or as a means, to render procreation impossible” is intrinsically evil:159
Code:
Thus the innate language that expresses the total reciprocal self-giving of husband and wife is overlaid, through contraception, by an objectively contradictory language, namely, that of not giving oneself totally to the other. This leads not only to a positive refusal to be open to life but also to a falsification of the inner truth of conjugal love, which is called upon to give itself in personal totality. . . . The difference, both anthropological and moral, between contraception and recourse to the rhythm of the cycle . . . involves in the final analysis two irreconcilable concepts of the human person and of human sexuality.160
and also this:
2399 The regulation of births represents one of the aspects of responsible fatherhood and motherhood. Legitimate intentions on the part of the spouses do not justify recourse to morally unacceptable means (for example, direct sterilization or contraception).
And here is a
link to where I got those from, online. It’s a great resource to have. The catechism is your best official resource available, and I would hope that you would already have one at your RCIA class (sorry if you already do!). If not, you really should go out and buy one from a bookstore somewhere and bring it along.
As for whether or not contraception is an infallible teaching or not, well the first article that I’ve linked to (which is from the Catholic Answers library) states that:
There is no way to deny the fact that the Church has always and everywhere condemned artificial contraception. The matter has already been infallibly decided. The so-called “individual conscience” argument amounts to “individual disobedience.”
While the Catechism itself is not an infallible document, it is probably the closest thing to it, and you can take anything and everything in there as being 99% infallible (if not more). Contraception is an infallibly defined teaching.
Now if your students have a hard time with this (and at first, it is a hard teaching), I would remind them that as a doctrine, this teaching comes from God and not from man. As such, God knows better than we do what is good for us and what will make us happy, as he made us! Contraception is an example (along with fornication and adultery) of doctrine that will actually make us happier by following it! Well, most likely, anyway. As the
Vademecum for Confessors 2:4, Feb. 12, 1997 states (and I have stolen this reference from the CA library page that I linked to above):
it [contraception] harms true love. It harms true love. For me, the second most important thing in my life is true love, as I would guess it is for many of your students too.
I hope you understand what I’m saying here! I don’t think I’ve done the best job in explaining…