I like the way Our Lord Jesus, the Best Professor of Theology, once explained it to a Mystic in speaking of His Grandparents St. Joachim and St. Anne. The careful reader will notice that the Lord Jesus is citing Sacred Scripture, and shows that marital love is good and holy when it is procreative and unitive: "Although she was now approaching old age and had been Joachim's wife for many years, she was always for him “the spouse of his youth, his joy, the most dear hind, the graceful fawn”, whose caresses always had the fresh charm of the first nuptial evening and sweetly fascinated his love, keeping it as fresh as a flower sprinkled with dew, and as ardent as a fire continuously kept burning.
Therefore, in their affliction, their childless state, they spoke to each other “words of consolation in their thoughts and troubles”. And eternal Wisdom, when the time came, besides teaching them in waking consciousness, enlightened them with dreams at night, visions of the poem of glory that was to come from them and was Most Holy Mary, My Mother. If their humility made them hesitant, their hearts trembled in hope at the first hint of God's promise. There was already certainty in Joachim's words: “Do hope... We shall gain our favour from God by our faithful love.” They were dreaming of a child: they got the Mother of God.
The words of the book of Wisdom appear to be written for them: “By means of her I shall acquire glory before the people... by means of her, immortality shall be mine and I shall leave an everlasting memory to my successors.” But to obtain all this they had to become masters of a true and lasting virtue which no event marred. Virtue of faith. Virtue of charity. Virtue of hope. Virtue of chastity.
The chastity of a married couple! They possessed it, because it is not necessary to be virgins to be chaste. And chaste nuptial beds are guarded by angels and from them descend good children who make the virtue of their parents the rule of their lives.
But where are they now [1944]? Now children are not wanted, neither is chastity.[prophetic!] I therefore say that love and marriage are desecrated. »
So the Lord only considers love and marriage to be desecrated when children are not wanted, nor that chastity which exists in a holy marriage.
That book btw has an Imprimatur from Bp. Danylak guaranteeing it teaches nothing against the Catholic Faith, and a practical seal of approval from Bp. Williamson, which is another testament for its orthodoxy. So it can safely be said this is authentic Catholic teaching on love within marriage.
Edit: And for those called to the higher state of Consecrated Virginity, the Mother of God, while Consecrating Herself wholly to God even in Her youth as a perpetual Virgin for His sake, said, from the same work, "If He wants a Virgin as His Mother, it means that He loves Virginity above all things. I want Him to love Me, His maiden, because of the Virginity which will make Me somewhat like His beloved Mother [at this time She did not yet not know that it was She, owing to Her Perfect Love for Him, Who was chosen to be Mother of God]". Later on, when teaching His Holy Apostles to become Perfect Priests and especially since they were going to be the First Bishops of the Church, He the great High Priest and model of Celibate Priests, told the holy Apostles that "it is a beautiful thing to be free from even the honest desire of a woman", just as every Bishop in particular and our Roman Rite Priests, and Monks, can and should be. Yes, truly beautiful, and very liberating, to love only God, above all things, and for His own sake, renouncing the world for union with Him. It all depends, then, on the state in life to which one is called.