All this brings us to the sexual dimension of marriage. God himself created sexuality, which is a marvellous gift to his creatures. If this gift needs to be cultivated and directed, it is to prevent the “impoverishment of an authentic value”.146 Saint John Paul II rejected the claim that the Church’s teaching is “a negation of the value of human sexuality”, or that the Church simply tolerates sexuality “because it is necessary for procreation”.147 Sexual desire is not some- thing to be looked down upon, and “and there can be no attempt whatsoever to call into question its necessity”.148
To those who fear that the training of the passions and of sexuality detracts from the spontaneity of sexual love, Saint John Paul II replied that human persons are “called to full and mature spontaneity in their relationships”, a maturity that “is the gradual fruit of a discernment of the impulses of one’s own heart”.149 This calls for discipline and self-mastery, since every human person “must learn, with perseverance and consistency, the meaning of his or her body”.150 Sexuality is not a means of gratification or entertainment; it is an interpersonal language wherein the other is taken seriously, in his or her sacred and inviolable dignity. As such, “the human heart comes to participate, so to speak, in another kind of spontaneity”.151 In this context, the erotic appears as a specifically human manifestation of sexuality. It enables us to discover “the nuptial meaning of the body and the authentic dignity of the gift”.152 In his catecheses on the theology of the body, Saint John Paul II taught that sexual differentiation not only is “a source of fruitfulness and procreation”, but also possesses “the capacity of expressing love: that love precisely in which the human person becomes a gift”.153 A healthy sexual desire, albeit closely joined to a pursuit of pleasure, always involves a sense of wonder, and for that very reason can humanize the impulses.
In no way, then, can we consider the erotic dimension of love simply as a permissible evil or a burden to be tolerated for the good of the family. Rather, it must be seen as gift from God that enriches the relationship of the spouses. As a passion sublimated by a love respectful of the dignity of the other, it becomes a “pure, unadulterated affirmation” revealing the marvels of which the human heart is capable. In this way, even momentarily, we can feel that “life has turned out good and happy”.154