"Many readers have written in to ask us about pornography. Is it acceptable for Christians to view adult entertainment? Our stance on pornography is directly informed by our position on sex and sexuality with regards to Christianity. Depending on the circumstances, the act of intercourse can be either a defilement of the body and soul through lust and indulgence of the senses, or it can be a celebration of God-given sexuality that uplifts the bodies and spirits of both partners. Likewise, pornography could be either degrading and sinful (as it almost always is), or it could depict acts that, when viewed appropriately, could enhance the sexual and sensual relationships of believers."
http://www.sexinchrist.com/pornography.html