Because like fornication, adultery and homosexuality, pornography is a "deed of the flesh" that "grieves the Holy Spirit" as stated in Galatians 5:19-21.
Ka sekai, lefoko "kgokafalo" le ranotswe e le "boitsholo jo bo sa siamang jwa tlhakanelodikobo"; "boitshwaro jo bo repileng" e le "boitshwaro jo bo repileng jwa go sa kgathale"; mme "mediro ya ditlhapelo" e le "meletlo ya botlhapelwa." - Bagalatia 5:19-21.