OK so I have this theory about contraception: nobody really wants to use it. It is a concession people make, and is not anybody’s first choice. Condoms don’t feel good and, along with other barrier methods, interfere with spontaneity. Artificial hormones are poisonous to the human body and the environment, and uterine implants (IUDs) are dangerous. Sterilization is too permanent for anybody who thinks they might change their minds later. And none of these are 100% effective.
Plus there is an entire realm we can explore surrounding the psychological and social implications of pathologizing female fertility, and how contraception debases all human life. There is so much wrong with contraception, and nobody really longs to use it as part of their sexual activity. It is a concession. (Prescription hormonal use for other medical reasons is legitimate; it is not primarily contraception.)
By speaking against this concession and promoting marriage as the proper context for sexual activity, the Catholic Church upholds the fullness of the “one flesh” teaching found in verses such as:
In one important respect, by prohibiting contraceptive use the Church is affirming what is already in people’s hearts. We don’t actually want to use it, and that’s OK. We’re not wrong for not wanting to use it. We are not wrong for viewing it as a concession, a compromise, second best. So the Church understands us better than we understand ourselves. Doesn’t this sound like Somebody Else we all know and love? Being the good mother that she is, she has received this teaching from Christ and she passes it along to us. It seems to me that this teaching is part of the ordinary and universal Magisterium, and so is dogmatic and infallible. This means, among other things, that nobody has the right to coerce anybody else into using contraception under any circumstances, that it is wrong to apply pressure to somebody to use it, and nobody should feel guilty for not wanting to use it (remembering, of course, that marriage is the only context for sexual activity).
This is more evidence that God wrote his law into our hearts.