Pornography 

#1
The scriptures repeatedly teach that the Spirit of the Lord will not dwell in an unclean tabernacle. When we worthily partake of the sacrament, we are promised that we will “always have his Spirit to be with [us].” To qualify for that promise we covenant that we will “always remember him” (D&C 20:77). Those who seek out and use pornography for sexual stimulation obviously violate that covenant. They also violate a sacred covenant to refrain from unholy and impure practices. They cannot have the Spirit of the Lord to be with them. All such need to heed the Apostle Peter’s plea: “Repent therefore of this thy wickedness, and pray God, if perhaps the thought of thine heart may be forgiven thee” (Acts 8:22). - http://www.lds.org/general-conference/2005/04/pornography?lang=eng

#2

Pornography, the carrier, is big business. It is evil. It is contagious. It is addicting. It is estimated that in recent years Americans alone spent $8–10 billion per year on hard-core pornography 1 —a fortune siphoned away from noble use and diverted to a devilish purpose!

Apathy toward pornography stems mostly from a widespread public attitude that it is a victimless crime and that police resources are better used in other areas. Many state and local ordinances are ineffective, sentences are light, and the huge financial rewards far outweigh the risks.

#3

The constant, consuming march of the pornography beetle blights neighborhoods just as it contaminates human lives. It has just about destroyed some areas. It moves relentlessly closer to your city, your neighborhood, and your family. Pornography is now more available than ever. At the click of a button, evil can be viewed in our homes on televisions and computer screens, in our hotels and movie theaters, or even in our places of employment, where access to the Internet is often provided.

#4

Let us join in the fervent declaration of Joshua: “Choose you this day whom ye will serve; … but as for me and my house, we will serve the Lord.” 8 Let our hearts be pure. Let our lives be clean. Let our voices be heard. Let our actions be felt.

Then the beetle of pornography will be halted in its deadly course. Pernicious permissiveness will have met its match. And we, with Joshua, will safely cross over Jordan into the promised land—even to eternal life in the celestial kingdom of our God.

President Thomas S Monson – July 2001 Ensign

https://www.lds.org/ensign/2001/07/pornography-the-deadly-carrier?lang=eng