It is time to review some basic principles that bear upon the question of the morality of contraception.
First, let us note that the word "contraception" is used to describe both a thing and an act. Only the act permits of moral analysis. There are many "things" called contraception, such as the many forms of the pill, the condom, the IUD, and the patch. Contraception as an act permitting of moral analysis is the act of doing something before, during, or after an act of spousal intercourse to prevent the act from achieving the end of procreation.
The Church teaches that acts of contraception are always against the plan of God for human sexuality, since God intended that each and every act of spousal intercourse express both the intention to make a complete, unitive gift of one's self to one's spouse and the willingness to be a parent with one's spouse. These meanings of the spousal act are, as Humanae Vitae stated, inseparable.
Moreover, many forms of contraception work not by preventing ovulation or preventing conception but by either destroying an embryonic human being or rendering the uterus an inhospitable place for an embryonic human being. These "contraceptives" are not truly contraceptives. They cause the death of a new human being and are rightly called abortifacients. Both contraception and abortion are absolute evils, with abortion being a much more serious evil.
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