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Question:

I think you exaggerate the damage caused by looking at women, whether on the street, or on the Internet. I consider myself a God-fearing Jew who keeps all of the mitzvoth, and I don't feel that looking at a pretty woman now and then, and enjoying the beauty that God created, is a sin that interferes in my worship of God.

Answer:

Here is an answer to your question by Rabbi Leon Levi, excerpted from the essay "Tikun Now!"

Don't fail the spiritual eye exam. Guard your eyes.

Vision possesses such lofty importance because the eyes are the windows to the "soul of the soul." A blemish to the sense of vision, when the eyes gaze upon some forbidden image, is grave indeed, as stressed by the verse in the Book of Eichah, "My eye affects my soul because of all the daughters of the city" (Eichah, 3:51).  This means that what a man sees can cause him to lose a portion of his holiness.