Hedonism

Hedonism is a school of ethics which argues that pleasure has an ultimate importance, and that humanity's most important pursuit is sensual self-indulgence.

The basic idea behind hedonistic thought is that pleasure is the only thing that is good for a person. This is often used as a justification for evaluating actions in terms of how much pleasure and how little pain (i.e. suffering) they produce. In very simple terms, a hedonist strives to maximize this net pleasure (pleasure minus pain).