Why is pornography a sin?

How can I explain to my co-workers that “It is to sin to look at porn”? Please reply back on why porn is a sin.

The virtue to which we are called with regard to sexual relationships is called chastity. Through integrity and self control, the chaste person observes the true meaning and intimacy of sexual relations. Pornography is gravely offensive to this. The Catechism of the Catholic Church (CCC) explains, “[pornography] perverts the conjugal act, the intimate giving of spouses to each other. It does grave injury to the dignity of its participants (actors, vendors, the public), since each one becomes an object of base pleasure and illicit profit for others. It immerses all who are involved in the illusion of a fantasy world.” (CCC 2354).

Christopher West, in his book Good News About Sex and Marriage (p.84), says it like this: “[Pornography] does nothing but foster in a man his fallen inclination to treat women as things for his own sexual gratification. A man who uses pornography, so long as he remains in its clutches, has incapacitated himself to love women properly… he cannot hope to have a healthy, pure relationship with a woman. He cannot hope to enter marriage honestly, fruitfully, and faithfully. Men who use pornography have emasculated themselves”.

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