I have no doubt he believed it was a sin, just curious as to whether he actually taught it. I can’t speak for Greek and the translation or what was meant by fornication.
"Holiness" is not a moral catagory, but we are not just animals
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Is a man poking another man fornication? What do you think, hell with trying to figure out the Greek.
He said he came to fulfill the law, not to alter it. He was born a Jew, of a Jewish mother, and was observant. being more like the Pharisees whom he condemned, than we realize. Evidentally he came often to Jerusalem to observe the Great feasts. Now on thing that distinguished such Jews from the pagans was a rejection of their lifestyle, including their sexuality. Ritual prostitution was part of the worship of the pagans, as was infant sacrifice. That was not always bloody. An unwanted child would simply be taken to an altar and there left to die, as an offering to that god. Pederasty was an integral part of Greek life, and the gymnasium was not unlike some place sin San Francisco, a place where men hooked up. The Jews rejected all that. Such sex would be ritually unclean. Where Paul speaks in Romans of such practices, where he speaks of such things to the church in Corinth, he is speaking as a Jew but also as the apostle of Jesus.