The question whether contraception is wrong outside of marriage is an odd one. All sex outside of marriage is wrong. One can ask whether non-marital sex plus contraception is worse or less bad than non-marital sex without contraception. Both are grave sins against chastity. Sins can combine in odd ways, however. It could be that something that would render a licit activity wrong, sometimes makes an illicit activity somewhat less wicked--though without removing its sinfulness.
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