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.

Dallin H. Oaks, "Pornography," Ensign, May 2005, 88