This is Satan's sharpest arrow, indeed. God has given us some shields to use when we're being attacked. First, agree with God that sexual immorality is wrong. Hollywood is wrong. The advertisers who simply want to make money off of us are wrong.
Sexual immorality is wrong.
The Cherokee Indians, in their marriage ceremony, are said to have joined hands across a running stream to signify that their lives would flow together forever. Agree with God that all sexual immorality is wrong. Second, guard your heart. This is Satan's target. The Greek here does not refer to natural, normal human instincts, but to the man who looks at a woman with the deliberate intention of lusting after her.