Consent makes acts permissible that would otherwise be impermissible. But how is this done by consent? And can any act be made permissible, or are there acts that are morally wrong even if affected persons have given their consent? These two questions are related – only by answering how consent makes acts permissible in general will we be able to answer questions about the possible limits of consent. Consent, it will be argued, does not make acts permissible by excluding reasons speaking against them. Consent rather makes acts permissible by eliminating the wrong-making property of the acts. And it can only do this in cases where the wrong-making property of the act is simply the fact that consent has not been give