When I say, "I love you," what do I mean. I could mean several things. If the love is the Agape type, it is unconditional love. It means that I love you no matter what you are like, or what you have done to me. It is God's type of love that He expresses to us when we don't deserve it.
If love is the Eros type, it is the intimate and sensual love. This is the love that is expressed with sexual feelings and the sexual act. This is the love that only the husband and the wife are to express to each other.
If love is the Philia type, then that love is expressed with friendship. That love simply means that you and I are friends. It is shown by being friendly.
If love is the Storge type, then that love is expressed with affection. One of the predictions of the end times is that people will be without natural affection. Affection is what a mother cow has for her baby calf. We have affection for each other in our family setting, father, son, father, daughter, mother, daughter, mother, son, and other relationships where there are natural feelings of kindness for each other.
I think in a healthy marriage, each marriage partner has each type of love, and expresses each. A husband and wife should have an unconditional love for each other that would cause them to love whether deserved or not, whether returned or not. A husband and wife in a healthy marriage should have intimate relations in which they are sexually attracted to each other, and in which they enjoy the touching, feeling, the sexual act, and all that goes along with the warm physical feelings that come with that. A husband and wife should be each other's best friends. Friendship is important in marriage. A husband and wife should have natural affection also that involves all family relationships. There should be affection and the showing of affection one to the other.