I seem to have read that pictures of naked women, and even them doing sexual acts, (a totally common part of pornography) have been drawn and have existed since as early as 500 BC. A lot of them were etched into cavern walls, some into rocks/stones, and what not. Yet the only thing the Bible appears to condemn about that kind of stuff is the idolatry aspects of it (a reference to the 2nd commandment). Having said that, in my personal opinion, pornography is generally inappropriate for people who are in a relationship, and especially who are married. Because no matter how one looks at it, pornography is not as good as marriage. I mean, you are only seeing the people either through a computer/TV screen, a magazine, and what not. They can not talk to you from their pictures, they can not express any feelings for you, and obviously you can not interact with them. Pornography can also get very boring, too, as practically every gallery, website, magazine, and what not, always displays the partakers doing the same old boring stuff (sexual intercourse, oral sex, etc), and that can get very boring. To put it simply, if pornography were an aircraft, it would be that clipped wing plane, the Dodo, in the PS2 game "Grand Theft Auto III". I do of course have to admit that, at the same time for many, pornography can be highly addicting, which obviously in turn leads to idolatry.