24 Therefore God also gave them up to uncleanness, in the lusts of their hearts, to dishonor their bodies among themselves, 25 who exchanged the truth of God for the lie, and worshiped and served the creature rather than the Creator, who is blessed forever. Amen. (Romans 1:24–25, NKJV)
Mankind is under the wrath of God, and for good reason (Rom. 1:18-21). The refusal to honor and thank God plunged humanity into the darkness of pride and the foolishness of elevating human wisdom above God and His truth (Rom. 1:21-22). This led to idolatry – the corruption of true worship (Rom. 1:23). Idolatry (false worship) feeds on fleshly lusts. Impure worship opens the door to immoral living. When God is ignored and His truth is devalued, the boundaries of moral restraint (that are set by divine truth) are increasingly ignored. Just as false worship abandons truth for lies, immorality abandons the moral restraints of truth. Instead of honoring God with the body, it is used to fulfill the sinful lusts of the heart (1 Cor. 6:13, 15, 19). One must not think he is honoring God while using his body to fulfill the dishonorable lusts of immorality. When the truth of God is exchanged for the lie of idolatry, immorality follows. God allows it to happen, but His wrath is revealed against it. You cannot serve the god of self, and expect to be blessed by God our Creator.
1 Therefore be imitators of God as dear children. 2 And walk in love, as Christ also has loved us and given Himself for us, an offering and a sacrifice to God for a sweet-smelling aroma. 3 But fornication and all uncleanness or covetousness, let it not even be named among you, as is fitting for saints; (Ephesians 5:1–3, NKJV)
There are repeated warnings in the Scriptures of falling into sexual sins. Here, being imitators of God and walking in sacrificial love are the preventative measures we take to avoid the moral defilement of “fornication and all uncleanness or covetousness.” Ironically, the world often calls fornication, “love,” as millions upon millions commit this sin in the name of “love.” Sexual uncleanness occurs outside of God-approved marriage, and is the fruit of covetousness (Heb. 13:4; cf. Exo. 20:17). These sins are “not even to be named” among Christians. R. C. H. Lenski correctly explains this to mean that “such vices are to be so far removed from us that even an intimation or a suspicion of their presence among us should not occur” (The Interpretation of St. Paul’s Epistles to the Galatians, to the Ephesians and to the Philippians, p. 596). Christians are not immune to sexual temptations; but, we must resist them and reject them whenever they come (1 Pet. 5:8-9). “Therefore submit to God. Resist the devil, and he will flee from you” (Jas. 4:7). Then, we can be “an offering and a sacrifice to God for a sweet-smelling aroma.”