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f you were a Christian you would not have the thoughts in your head that would lead you to ask.
It would be beside the point. Your question shows your absolute ignorance of what sex is, how it was created, what it is for, or anything about it except the mechanism of it. Also, your inability to experience it.
God created us, created the world, made it to operate in a certain way. Sex is one of the major things God created and blessed us with. Lots of things revolve around it. Pornography has absolutely no part in sex, it is a non issue.
If you go back to Genesis, it will explain just what sex is. Go to the book Song of Solomon and it gives a lot of the spiritual and physical of sex. Each month a woman has her seed die and creates a new one. God is involved in sex. It represents all the love and caring that marriage is, and the possibility of creating new life.
The thing you are seeing in pornography is taking something holy and dragging it in the dirt. Satan loves it, Satan usually uses God's words when He temps us. He is taking something of God to make it hateful, it is one of Satan's crowning achievements.