Much like a vibrator, a utility cock is someone's dick you use simply for pleasure. Kind of like a use it and lose it until you need it again kind of thing.
A philosophy that people should act in order to increase the frequency and longevity of pleasure throughout the world. Although the idea acting to increase long-term and global pleasure sounds desirable, Utilitarians believe that the pleasure of many outweigh pleasure of few. A Utilitarian may believe that killing one person in order to increase the pleasure of many or killing someone and harvesting their organs would be a just action. Some Utilitarians have seen that this can be dangerous; many Utilitarians, because of this, follow a slightly different ideology that they should act to increase the frequency and longevity of pleasure throughout the world by following the best social standards.
People who believe in Utilitarianism believe that it is all right to kill one person, take their organs and distribute them to many.