The contraception that the Catholic Church permits is called abstinence. It is far more effective against STD's and pregnancy's than any other form of contraception.
That may be alright for their members but they have no right to try to apply it to the rest of us. If jerking off in the corner is your idea of fun then go for it. Vasectomies work well for many of us and so do condoms and pills.
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Also note, the the Catholic Church also condemns premarital sex, and sex between people that are not married to each other. This doesn't seem to stop those Africans you are referring to. Yet they use the excuse of the Catholic Church to not use condoms. So, you tell me, who's fault is it really. The Catholic Church, or the individuals that choose to only follow and listen to PART of the Catholic Church doctrine?
Would that be marriage as the Catholic church defines it? Or are other definitions permitted. According to Cherokee law if you are living together you are married. Worked for my ancestors long before any catholic came to North America. Works for me.