The answer you're looking for could be a HEDONIST or an EPICUREAN.
"Hedonism" is the general philosophical term for someone seeking pleasure -- though how pleasure was defined differed between different persons.
Epicureans were a particular group in Greco-Roman history that had "pleasure-seeking" as a core belief.
Let's clarify what "pleasure seeking" meant in the original theory of the the ancient Greek philosopher Epicurus. Â Epicurus (341-270 BC) believed that the universe and all life within it is essentially a random interaction of atomic particles. Â So according to Epicurus, human life is what we have while we're living in this form, but there is no afterlife of individual souls. Â So he advocated that the best way to live life, while we are alive, was to seek pleasure and avoid pain. Â But his definition of "pleasure" was not some wild party, but the most comfortable and fulfilling sort of mental and physical existence. Â So he urged living a life of moderation in order to avoid as much pain as possible. Â Pursuing highly emotional relationships or stressful responsibilities in society would cause too much mental pain, he thought, so he refrained from such things. Â Similarly, eating too much of rich foods can make you sick, or drinking too much leaves you with a hangover -- so the pain isn't worth the initial pleasure you might feel. Â Epicurus and his followers lived very simple lives in order to be free of as much mental and physical pain as possible. Â
Some have characterized the "Epicurean" way of life as one that says, "Eat, drink and be merry, for tomorrow we die!" Â But Epicurus himself would not have pursued a lifestyle that sought excessive pleasure through eating, drinking and partying, because too much pain would come along with it..