Some have thought that learned men should be the standard. However, Paul states the impossibility of men knowing the things of God apart from God. Christ's church must abhor these, for to be found guilty of them will bar the doors of heaven. These are the words of a holy God telling us exactly what He wants us to avoid. Adultery is unlawful sex between two people, with at least one of these being married.
Fornication is immorality of every sort.
It is the Bible word to describe any sort of sexual sin. Uncleanness literally means impurity and refers to those thoughts and actions that lead to immorality. Lasciviousness means absence of restraint, indecency, and includes unchaste behavior of dress, speech and action. How unfortunate that men have left God's wonderful design of sex and have perverted it and set up their own standards in this area. There are the sins of idolatry and witchcraft.