There is a Biblically authorized marriage that is of a lust and fornication condition of the believer and not of the spirit and heart.
“Now concerning the things whereof ye wrote unto me: It is good for a man not to touch a woman. Nevertheless, to avoid fornication, let every man have his own wife, and let every woman have her own husband." 1Corinthians 7:1,2
Here Paul instructs the male believer not to have fornication with a woman (believer or not). This also applies to women not to fornicate with male believers or unbelievers. Paul then instructs the believer to marry, not because you are "flesh of my flesh and bone of my bone," but to avoid fornication.
Now this is different than the One Flesh marriage covenant seen in Genesis 2 of the spirit and soul are united. Here we see another reason for when marriage begins as it could be known as, “Fleshly Marriage,” which may not last long, and could end up in divorce because it thrives on uncontrollable sexual appetites.