A secondary purpose is procreation. Another reason for marriage is to provide a legitimate outlet for our sexual drive. Marriage also functions as a picture of the relationship between Jesus Christ and the church. Although most individuals will get married, there is a special enabling for some to be single. Singleness provides greater freedom for service to the Lord and is to be honored in the church.
Biblical singleness is a state without immorality.
There are two legitimate reasons for a believer to seek a divorce. The first reason is adultery. The second reason is when the unbelieving spouse leaves. This is also called willful desertion. Grounds for Remarriage Remarriage is always allowed after a divorce, except for the professed believer who divorces someone for an unbiblical reason.