Christian ethics Cyrenaic hedonism Cyrenaicism Stoicism altruistic ethics appetite appetitiveness aretaics casuistry categorical imperative comparative ethics deontology egoistic ethics empiricism epicureanism epicurism ethical formalism ethical hedonism ethical philosophy ethology ethonomics eudaemonics eudaemonism evolutionism golden rule hedonic calculus hedonics intuitionism luxuriousness luxury moral philosophy perfectionism pleasure principle pleasure-loving pleasure-seeking psychological hedonism sensualism sensuality sensualness situation ethics sybaritism unchastity utilitarianism voluptuousness