Matthew 5:32 (King James Version)
32But I say unto you, That whosoever shall put away his wife, saving for the cause of fornication, causeth her to commit adultery: and whosoever shall marry her that is divorced committeth adultery.
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Because in the 1st century people married when they were still (by our understanding) adolescents, and we have not been taught what the true meaning of 'fornication' meant back then, we see sin where it does not exist.
In the 1st century, fornicators were located in the pagan temples of worship. Aphrodite, Adonis, Dionysus, etc. There both male and female fornicators (prostitutes) that worked these temples. The King James version correctly translates the Koine Greek word pornos and porneia as prostitute and/or idolater. In 1Cor.5 the Apostle Paul compared the man who was having a sexual affair with either his natural mother or his mother-in-law, the wife of his father, as a fornication so great that even the temple prostitutes have not even committed. Paul goes on in the 6th chapter of 1Cor. to compare how our bodies are also temples but temples of Christ and not temples of some pagan god/s:
1 Corinthians 6:15-20 (King James Version)
15Know ye not that your bodies are the members of Christ? shall I then take the members of Christ, and make them the members of an harlot? God forbid.
16What? know ye not that he which is joined to an harlot is one body? for two, saith he, shall be one flesh.
17But he that is joined unto the Lord is one spirit.
18Flee fornication. Every sin that a man doeth is without the body; but he that committeth fornication sinneth against his own body.
19What? know ye not that your body is the temple of the Holy Ghost which is in you, which ye have of God, and ye are not your own? 20For ye are bought with a price: therefore glorify God in your body, and in your spirit, which are God's.