Most of us would answer that question in some way that has hopefully grown past the "I really love her, man" kind of statement. Let's forgo the stupidity of the "I really can't keep my hands off of her" answer and get on with why our Father in heaven has given us permission to be married.
In a nutshell, God has had us men covenant with Him to marry the one He has chosen for us, for His honor and for her best interests. I know that kind of thought has rarely passed through our world-trained, pea-brain ability to understand His ways about marriage; but it is, none-the-less, true. We are to join together with one of His precious children so that she has fertile soil to become all that she can be in Him. That honors Him!
In Ephesians 5, we husbands are called to lay our lives down for our wives in the way that Jesus laid His life down for the church. He died so that we could live. That is how the Lord can use marriage as an example of the relationship of Christ and His church.
When two people are joined together, they are given the privilege of knowing the most intimate details of the other person. They get to see whatever is undone in the other. Most of the time, especially after many years together, those cute little habits or actions become a source of irritation, sometimes even separation, instead of looking at them with Christ's heart. Jesus would hold them before His Father so that we and our wives could be healed. So should we.
God sees our job in marriage as laying down our needs, our desires, and our comforts, and living for the best interests of our wife and our children. The best interests of our circle of influence violates every area of our fleshly comfort zone. It demands that we live in the spiritual zone where Jesus lived for us. That is why He has given us someone to go through our lives with. They are to be given an atmosphere to learn how to love Him with all of their hearts. We are to provide that atmosphere by the power of the Holy Spirit. How's that working for you?
Let's talk more!