Hedonism is a school of thought that argues that pleasureis the only intrinsic good. In very simple terms, a hedonist strives to maximize net pleasure (pleasure minus pain).
Ethical hedonism is the idea that all people have the right to do everything in their power to achieve the greatest amount of pleasure possible to them. It is also the idea that every person's pleasure should far surpass their amount of pain. Ethical hedonism is said to have been started by a student of Socrates, Aristippus of Cyrene. He held the idea that pleasure is the highest good.
Hedonism vs. Utilitarianism: Utilitarianism addresses problems with moral motivation neglected by Kantianism by giving a central role to happiness. It is an ethical theory holding that the proper course of action is the one that maximizes the overall "good" of the society.
What comes first?