Reference:
"However, suppose a Christian has secretly viewed abhorrent, sexually degrading pornography for years and has done everything possible to conceal this sin. Such pornography might feature gang rape, bondage, sadistic torture, ......When others become aware of his conduct, he is deeply ashamed. He has not been brazen, but the elders may determine that he has ‘given himself over’ to this filthy habit and has practiced ‘uncleanness with greediness,’ that is, gross uncleanness. A judicial committee would be formed because gross uncleanness is involved..... " From the "WT online library" copyright WTBTS.