Well, as i understand it the Jews had certain laws that were "ceremonial" such as circumcision and dietary laws that were not necesarily "moral" like the law of love for God and one's fellow man. When the Gentiles were converted to the Christian faith, some of the Jewish Christians, the majority of which were Jews at the time, insisted that the Gentiles become like they were and keep all the "Law of Moses" including circumcision and the ceremonial law. As I understand it the Council of Jerusalem freed Gentiles from observing these "ceremonial laws" with the acception of some which ,if they did not observe, would be exceedingly offensive to the Jews. (circumcision, eating things strangled, things offered to idols, blood etc.) What I don't understand is how fornication got mixed up with those laws, presumably ceremonial, that the Gentiles were still going to keep simply to keep from offending the Jews. It seems to me that fornication would be "moral" rather than ceremonial.