someone who tries to have as much pleasure as possible, according to the belief that the most important thing in life is to enjoy yourself

The Marquis de Sade was a hedonist who believed there should be no limits on human behaviour. 萨德侯爵是一名享乐主义者，他认为人类的行为不应受到限制。

Wilson, a bachelor, is a heavy drinker and a womanizer, but he's not a simple hedonist. 威尔逊是个单身汉，酒量大、好色，但他不是一个简单的享乐主义者。