MHeath said: "There are, however, more factors to consider than one's strict marital status when determining how "free" one is to marry. Although a person may not be disqualified from marriage by a former marriage bond, he may have other bonds and obligations which make marriage inappropriate. Paul asks, "Know ye not that he which is joined to an harlot is one body? for two, saith he, shall be one flesh" (I Corinthians 6:16). Although the physical union is not a marriage bond, it is a physical bond. It is also an emotional bond. And it may be a procreative bond. THE MORE TANGLED THESE BONDS, THE MORE INAPPROPRIATE MARRIAGE WOULD BE.
That is another huge one to discuss on a different topic, since it raises the questions of “when” are you married. Some people believe that you are married to a person the moment you have sex with them. Which means alot of premarital sex people would be married already, not by vows, but the mere act of sex. That is definitely a major topic for another discussion. I personally believe there is vows/covenant along with the marriage consummation with your original spouse that make for a legitimate marriage. The vows + consummation make for a legitimate marriage with the expectation that you are not already married to someone else. This also has historical value.