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Yes­ter­day, I went and gave some blood. This got me think­ing about the moral sta­tus of donat­ing blood. It’s got to be either oblig­a­tory or supereroga­tory. You might recall these def­i­n­i­tions from my pre­vi­ous post on boy­cotting mar­riage: Oblig­a­tory: If an action is morally oblig­a­tory, that means that you must do it, from the moral …