God's plan for a successful marriage is that it should be an exclusive sexual relationship with one person, for life. Genesis 2:18-25 describes marriage as a divine institution. God presented Adam with Eve and established the first marriage. Some of God’s purposes for marriage as stated in the Bible are companionship(Genesis 2:18) ,procreation(Genesis 1:28), mutual and undefiled pleasure ( 1 Corinthians 7:4-5,Proverbs 5:18-19 Song of Solomon; Hebrews 13:4), prevention of immorality (1 Corinthians 7:2,5), the serving of Christ as a whole and properly representing the spiritual relationship between Christ and the Church (Ephesians 5:22-33), and the raising of godly descendants (Malachi 2:13-16). The bond of marriage when respected leads to the good of not only the couple and their children, but also to the good of the society as a whole, for the family unit is the building block of any society and nation.
Many people in our society live together before marriage to see if they are compatible as they don't want to divorce. This is definitely a sin of fornication in Gods eyes but not in worlds view. Living together is wrong: it is against God's law, and is morally indefensible. Living together shows a total lack of trust, faith and obedience in God and a failure to commit to Him the choosing of a life mate. Living together is nothing but trial and error marriage method. Its like experimenting the relationships. The fact is about 60% of marriages in the US end up in a divorce. Most of the western countries live together in relationship and has been accepted and encouraged in their society. That is why they have highest divorce rates, violence, crimes, broken families, life of promiscuity and drugs, loneliness ,sexual sins, high rates of legal abortion, higher rates of sexually transmitted disease, Neurotic disorders, health risks and many people never marry because they can not find Mr. and Ms Right and Perfect. Directly or indirectly it has contributed for single Parents/families with no Man as a spiritual and family leader to protect their families.
Many researchers say that Couples who move in together before marriage hare two times more likely to divorce than couples who marry before living together.
• Couples who lived together before marriage tend to have poorer-quality marriages than couples who did not cohabitate before marriage.
• Couples who cohabitate before marriage tend to be less committed to their spouse and less likely to remain faithful than couples who did not cohabitate.
• Men who cohabit are especially less likely to ever commit to marriage.
• Couples who cohabitate tend to have less traditional views about marriage which, among other things, tends to weaken their faith and belief in God.
• Children who live with their parents in cohabitation arrangements tend to have more emotional and/or academic problems than children who live with two married parents.
• Children whose parents modeled cohabitation are more likely to do the same than children whose parents modeled marriage first.
Sex before marriage is just as wrong as adultery and other forms of sexual immorality, because they all involve having sex with someone you are not married to. Premarital sex is repeatedly condemned in Scripture, along with all other forms of sexual immorality (Acts 15:20; Romans 1:29; 1 Corinthians 5:1; 6:13, 18; 7:2; 10:8; 2 Corinthians 12:21; Galatians 5:19; Ephesians 5:3; Colossians 3:5; 1 Thessalonians 4:3; Jude 7). The Bible promotes complete abstinence outside of (and before) marriage. The Bible tells us over and over again to avoid, flee from, run from temptation - especially sexual immorality. By living with someone of the opposite sex you set yourself up for temptation
The Bible tells us to avoid the appearance of evil (1 Thessalonians 5:22; Ephesians 5:3), to flee from immorality, and not to cause anyone to stumble or be offended.
"Observe and obey all this words which I command you, that it may go well with you and your children forever, when you do what is good and right in the sight of the Lord your God." (Deuteronomy 12:28)
We need to delight in the Lord by finding pleasure in knowing Him and trusting that He will delight us in return. “Delight yourself in the LORD and he will give you the desires of your heart” (Psalm 37:4). We need to pray to God day and night with praise and Thanks giving and with supplication and prayers to find a suitable life mate for us.
Proverbs 3:6 tells us, “In all your ways acknowledge him, and he will make your paths straight.
Marriage, in a Christian's life, should be based on a decision directed by the Holy Spirit. If we will totally commit to do His will we will never be disappointed in the one He sends into our lives. God will bring him/her into our lives as we are in the process of looking, according to His perfect will and timing. If we pray, God will lead us to the person He has for us. If we wait for His timing, we will be given the person who fits best with our background, personality, and desires. We have to trust in Him and His timing (Proverbs 3:5), even when His timing is not our timing. God's timing is perfect, and with faith and patience, we will receive His promises (Hebrews 6:12). If we maintain close fellowship with God, He will lead us and guide us. If a person is walking with the Lord and truly seeking His will, God will lead that person to the spouse He intends. God will lead us to our “soul mate” if we submit to Him and follow Him.
Final word we have to be Godly examples in everything. “Don't let anyone look down on you because you are young, but set an example for the believers in speech, in life, in love, in faith and in purity” (1 Timothy 4:12).