slimboyfat - you allude to the April 10th 2012 letter to elders that made a distinction between regular porn and "abhorrent" pornography:
He may continue to serve if his involvement consisted of (1) a few brief viewings, (2) he displays a heartfelt desire to desist from looking at pornography in any form, (3) the elders are convinced that he will refrain from viewing pornography, (4) he continues to retain the respect of others who are aware of what he did, and (5) his conscience allows him to do so.
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An entrenched practice of viewing, perhaps over a considerable period of time, abhorrent forms of pornography that is sexually degrading. Such pornography may include homosexuality (sex between those of the same gender), group sex, bestiality, sadistic torture, bondage, gang rape, the brutalizing of women, or child pornography. Brazen conduct would be involved if the offender was promoting such material, such as by inviting others to view it, thus giving evidence of a brazen attitude. — w12 3/15 pp. 30-31; w06 7/15 p. 31.
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Thererefore, viewing pornography escalates to gross uncleanness if the type of pornography viewed was abhorrent or sexually degrading in nature, as described in the second example above. An additional factor to be considered would be if it were a practice for "many years." As a general principle, when these elements are present, a judicial committee would need to handle the matter. At Ephesians 4:19 Paul stated: "Having come to be past all moral sense, they gave themselves over to loose conduct to work uncleanness of every sort with greediness." (Gal. 5: 19; w83 3/15 p. 31 par. 3) When an individual has 'given himself over' to this unclean practice as evidenced by his repeatedly viewing abhorrent pornography, the matter has escalated to gross uncleanness and needs to be handled judicially. — w06 711 5 pp. 29-3 1.