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http://en.wikipedia.org/wiki/Moral_relativism

In philosophy, moral relativism is the position that moral or ethical propositions do not reflect objective and/or universal moral truths, but instead make claims relative to social, cultural, historical or personal circumstances. Moral relativists hold that no universal standard exists by which to assess an ethical proposition's truth; it is the opposite of moral absolutism. Relativistic positions often see moral values as applicable only within certain cultural boundaries or in the context of individual preferences. An extreme relativist position might suggest that judging the moral or ethical judgments or acts of another person or group has no meaning, though most relativists propound a more limited version of the theory.