You shall not make for yourself a carved image – any likeness of anything that is in heaven above, or that is in the earth beneath, or that is in the water under the earth; you shall not bow down to them nor serve them. For I, the Lord your God, am a jealous God, visiting the iniquity of the fathers upon the children to the third and fourth generations of those who hate Me, but showing mercy to thousands, to those who love Me and keep My commandments. (Exodus 20:4-6)
The commandment to not make a carved image, or any likeness of anything God created, applies today as it pertains to pornography. God created the human body and it should not be idolized in an immoral way. The human body is to be respected and honored as a “very good” creation of God (Genesis 1:31).
It is a sin to look at this any other way, especially looking with lust, or with a propensity to use images of the human body – naked or not – to fulfill sinful thoughts or occasions to sin. As God said, we are not to bow down nor serve anything made as a likeness of something He created.
The conclusion is simple: It is a sin to idolize the human body in picture or any other man-made way. This second of the 10 Commandments might be the strongest Biblical argument against pornography.