Do you have a copy of the Catechism of the Catholic Church? If you read PART THREE: LIFE IN CHRIST: SECTION TWO:
THE TEN COMMANDMENTS: CHAPTER TWO “YOU SHALL LOVE YOUR NEIGHBOR AS YOURSELF”
THE SIXTH COMMANDMENT. You would find an answer. I shall quote some it here.
If you have any questions take a look on this website.
III. THE LOVE OF HUSBAND AND WIFE
2360 Sexuality is ordered to the conjugal love of man and woman. In marriage the physical intimacy of the spouses becomes a sign and pledge of spiritual communion. Marriage bonds between baptized persons are sanctified by the sacrament.
2361 "Sexuality, by means of which man and woman give themselves to one another through the acts which are proper and exclusive to spouses, is not something simply biological, but concerns the innermost being of the human person as such. It is realized in a truly human way only if it is an integral part of the love by which a man and woman commit themselves totally to one another until death."143
Tobias got out of bed and said to Sarah, “Sister, get up, and let us pray and implore our Lord that he grant us mercy and safety.” So she got up, and they began to pray and implore that they might be kept safe. Tobias began by saying, “Blessed are you, O God of our fathers. . . . You made Adam, and for him you made his wife Eve as a helper and support. From the two of them the race of mankind has sprung. You said, ‘It is not good that the man should be alone; let us make a helper for him like himself.’ I now am taking this kinswoman of mine, not because of lust, but with sincerity. Grant that she and I may find mercy and that we may grow old together.” And they both said, “Amen, Amen.” Then they went to sleep for the night.144
2362 "The acts in marriage by which the intimate and chaste union of the spouses takes place are noble and honorable; the truly human performance of these acts fosters the self-giving they signify and enriches the spouses in joy and gratitude."145 Sexuality is a source of joy and pleasure:
The Creator himself . . . established that in the [generative] function, spouses should experience pleasure and enjoyment of body and spirit. Therefore, the spouses do nothing evil in seeking this pleasure and enjoyment. They accept what the Creator has intended for them. At the same time, spouses should know how to keep themselves within the limits of just moderation.146
2363 The spouses’ union achieves the twofold end of marriage: the good of the spouses themselves and the transmission of life. These two meanings or values of marriage cannot be separated without altering the couple’s spiritual life and compromising the goods of marriage and the future of the family.
The conjugal love of man and woman thus stands under the twofold obligation of fidelity and fecundity.
2364 The married couple forms "the intimate partnership of life and love established by the Creator and governed by his laws; it is rooted in the conjugal covenant, that is, in their irrevocable personal consent."147 Both** give themselves definitively and totally to one another**. They are no longer two; from now on they form one flesh. The covenant they freely contracted imposes on the spouses the obligation to preserve it as unique and indissoluble.148 “**What therefore God has joined together, let not man put asunder.”**149
2365 Fidelity expresses constancy in keeping one’s given word. God is faithful. The Sacrament of Matrimony enables man and woman to enter into Christ’s fidelity for his Church. Through conjugal chastity, they bear witness to this mystery before the world.
St. John Chrysostom suggests that young husbands should say to their wives: I have taken you in my arms, and I love you, and I prefer you to my life itself. For the present life is nothing, and my most ardent dream is to spend it with you in such a way that we may be assured of not being separated in the life reserved for us. . . . I place your love above all things, and nothing would be more bitter or painful to me than to be of a different mind than you.150
I hope this helps.