The only way they will learn that their entire existance is to provide a few warm wet holes for men, is if we treat them that way constantly. They yearn to be taught and then reminded of their worthlessness and penchant for unbridled obedience. The only pleasure they might feel is accidental and unfortunate. Shame, humiliation, regret, fear, and embarrassment are the only feelings that bring me arousal, so any feeling or emotional outside of that serve no purpose and should be punished as severely and brutally as possible. Blindfolds, ear plugs, and anything else that strips it of its senses and humanity will help.