If we use your interpretation, then: Adultery (if it's not with temple prostitutes etc.) is not sufficient cause for divorce, Matt 5:23
1Co 5:1 doesn't involve sex with prostitutes or on behalf of a false religion.
1Co 7:2 doesn't work with that interpretation. Marrying a woman wouldn't deal with fornication; after all, he'd already have that woman (sexually) whether he married her or not. If having her sexually before marriage isn't sinful, this can't be about sex with prostitutes, etc.
I was trying top broaden the definition. Yes..It can cover all sorts sexual impurity.
Yet, it was mostly used when addressing the Temple practice conditioning found amongst pagans in Roman cities.
Ephesus had some serious problems in this area. Not to mention "sin-city" for the Romans, Corinth.
For example:
Ephesians 5:4 (in the Greek) was inspired by the cultural norms of the pagan mentality people.
"Neither filthiness, nor foolish talking, nor jesting, which are not convenient:
but rather giving of thanks."
Foolish talking was dealing with a cultural norm. It was to speak jokingly as a means to arouse someone sexually.
Foolish jesting addressed the common practice of using tactile touching. A physical way of touching another (in a jesting way) as to arouse them physically.
The Gentiles before the Holy Spirit began to transform them lived in what was a socially acceptable raunchy, promiscuous atmosphere. Rome would be like walking into a gay bar for straight people. Bisexuality ran high in Rome. Today- Its what the new millennials are being demonically drawn into because the church has ceased producing salt teachings able to refute intelligently the lies that have been raised up to oppose the Bible.
Satan today wants to have a revival of the old Roman culture where he once thrived and who's thinking was appreciated. Its seen in our media every day in its desire to propagandize the youth into the regressive old ways, while calling it being progressive. Ignorance of history is allowing for bad history to repeat itself.
grace and peace....