Light is a revealer of those things we cannot see in the dark. But I say unto you, That whosoever looks at a women to lust after her, has committed adultery with her already in his heart. This is a simple word from Jesus and must be taken literally. The sin, which Adam introduced into the world, gave birth to these things, which brings forth death. Everything brought into this world, results in a physical death.
People die, animals die, plants and tree's die.
This world is about death but our lives can be about life. The only bright spot in this dark decaying world is the light, which comes from Christ shinning through all those who believe and follow the teachings of Jesus Christ. Do you not know that your body is the temple of the Holy Ghost which is in you, which you have of God, and you are not your own. You as a born again Christian will be tempted with lust or pornography. Ever time you give in to these urges and lust you are grieving or ignoring the voice of God.