So according to the Bible, if you practice sex without a marriage license you are in error; you are actually committing a sin against yourself. “Flee fornication. Every sin that a man doeth is without the body; but he that committeth fornication sinneth against his own body” (Corinthians I 6:18)
I’m telling you this so you can get away from the sin of fornicating sex and join yourself to Godly sex. “Know ye not that the unrighteous shall not inherit the kingdom of God? Be not deceived: neither fornicators, nor idolaters, nor adulterers, nor effeminate, nor abusers of themselves with mankind. Nor thieves, nor covetous, nor revilers, nor extortioners, shall inherit the kingdom of God” (Corinthians I 6:9-10)
I didn’t make this up, this is God saying this, and I’m just the one quoting it. This is where God puts fornication as judging it from his perspective, that’s why he said flee away from it. “Nevertheless to avoid fornication, let every man have his own wife, and let every woman have her own husband” (Corinthians I 7:2)