A libertarian, like anybody else, is a limited government to himself. Part of this is natural, because nature allows people and libertarians only a limited amount of freedom. Take government away from a libertarian or anybody else, and that person is dead. Agreements and contracts between people make tremendous changes in freedom, liberty and government. The difficult part in defining true libertarianism is the subtleties of the contracts and agreements - like getting married, for instance, even without Sate involvement.