Value Hedonism, occasionally with assistance from Motivational Hedonism, has been used to argue for specific theories of right action (theories that explain which actions are morally permissible or impermissible and why). The theory that happiness should be pursued (that pleasure should be pursued and pain should be avoided) is referred to as Normative Hedonism and sometimes Ethical Hedonism. There are two major types of Normative Hedonism, Hedonistic Egoism and Hedonistic Utilitarianism. Both types commonly use happiness (defined as pleasure minus pain) as the sole criterion for determining the moral rightness or wrongness of an action. Important variations within each of these two main types specify either the actual resulting happiness (after the act) or the predicted resulting happiness (before the act) as the moral criterion. Although both major types of Normative Hedonism have been accused of being repugnant, Hedonistic Egoism is considered the most offensive