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"In the conjugal act it is not licit to separate the unitive aspect from the procreative aspect, because both the one and the other pertain to the intimate truth of the conjugal act: the one is activated together with the other and in a certain sense the one by means of the other. This is what the encyclical teaches (cf. HV 12).There is not one telos to the sexual activity, but two. Sex in marriage is for the good of the spouses, and the unitive purpose of sexual union is still served in sex employing other hypothetical forms of BC.
Therefore, in such a case the conjugal act deprived of its interior truth, because artificially deprived of its procreative capacity, ceases also to be an act of love.
It can be said that in the case of an artificial separation of these two aspects, there is carried out in the conjugal act a real bodily union, but it does not correspond to the interior truth and to the dignity of personal communion: communion of persons. This communion demands in fact that the “language of the body” be expressed reciprocally in the integral truth of its meaning."
~Bl. Pope John Paul II
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