There is a popular illustration that is often preached to help warn believers and non-believers of the dangers of sexual sin. It is often told that sex within the confines of marriage is like a fireplace, which, when in a controlled environment, provides blessing, warmth, and visual stimulation that is not harmful or dangerous. Any kind of fire outside of that contained and safe environment will spread, consume, and destroy, because that is how fire behaves. This illustration, and many others like it, is not entirely wrong when depicting the proper context for sex in a marriage relationship. And other times it is heavily used to warn the masses from the devastating, earthly consequences of sexual sin. Although I would not dogmatically disagree with this illustration, I find that it falls short in recognizing how adultery functions first in the heart, and perhaps how most people view sexual sin in reality. Allow me to give my illustration.