In the world, fidelity and physical intimacy is very different from Heavenly Father’s perspective. Couples could avoid problems caused by misunderstandings of physical intimacy and fidelity, if they were well taught at home by loving parents.
Elder Barlow said: “Why does something so beautiful sometimes become a source of so many problems? Part of the difficulty stems from mistaken ideas. Some people still believe that sexual intimacy is a necessary evil by which we have children. These people get an inaccurate view from parents who were too embarrassed to discuss such matters with their children or who were so concerned that their children live the law of chastity that they taught only the negative consequences of the improper use of intimacy.”(Barlow, 1986)
When reading his quote, It was inevitable to remember my confusion about physical intimacy while growing up. In my childhood, it was common to see my parents arguing about their perspectives: reproduction x gratification. When I was older, I researched in Church books to learn what Heavenly Father thought about that. Gladly I was able to understand the purpose of physical intimacy before I married. But I wonder how many people have misconceptions about that and how it affects them, like it happened with my parents. So I would like to clarify some here:
1- Physical Intimacy does not comes from evil
When talking about physical intimacy, we should be careful to not pass the wrong message, especially to adolescents. Our intent to help our youth to wait until the right time of marriage covenant, can sometimes create an idea that physical intimacy is wrong or bad. Actually we should highlight that it comes from God, and as children don’t drive a car, physical intimacy should not be used outside of marriage covenant.
“The Bible celebrates sex and its proper use, presenting it as God-created, God-ordained, God-blessed. It makes plain that God himself implanted the physical magnetism between the sexes for two reasons: for the propagation of the human race, and for the expression of that kind of love between man and wife that makes for true oneness. His commandment to the first man and woman to be ‘one flesh’ was as important as his command to ‘be fruitful and multiply.’ ” (Billy Graham, Ensign, May 1974, p. 7.)
2- Physical intimacy vs submission
“Ephesians 5:22 some have erroneously believed that this scripture means women are to submit or yield themselves to their husbands even if they do so unwillingly.”(Barlow, 1986)
It seems hard to become one if women are forced by men, and men are discouraged to consider their wife feelings. But what we learn from modern prophets is that we should respect each other, and any act of selfishness is condemned by God, including in physical intimacy
3-The purpose of physical intimacy
I think Heavenly Father would not gives us such strong power and desire, if it was to be used only for reproduction. It’s true that we are commanded to be fruitful and multiply, and with physical intimacy we are able to obey this commandment. But also, Heavenly Father commanded Adam and Eve to be one flesh. (Mark 10:8)
4- Pornography, physical intimacy, and fidelity
The use of pornography or other artifacts change the purpose of physical intimacy, and damage the couple relationship. The ability to feel close to each other through physical intimacy is destroyed, and fidelity is affected. The focus of pornography and infidelity is their own satisfaction, so it's based in selfishness and lust. These are not expression of love.
References:
Barlow, B.A. (1986). They twain shall be one: Thoughts on intimacy in marriage. Ensign, Sep 1986, 49.