hedonist

[ˈhɛd(ə)nɪst, ˈhɛdənɪst, ˈhiːd(ə)nɪst, ˈhiːdənɪst]

NOUN

1.     a person who believes that the pursuit of pleasure is the most important thing in life; a pleasure-seeker.
"she was living the life of a committed hedonist"