Originally a pejorative term denoting sinful self-indulgence, luxury [from the Latin for "excess"] has only in the past couple of hundred years come to acquire positive connotations of costliness and comfort. The idea that there's a "necessary" amount of pleasure and comfort beyond which one ought not to go is, of course, old-fashioned and absurd. So to describe a lecherous (or just sensuous) person as "luxurious" is equally absurd. That said, there's a strong school of thought among idlers - Lin Yutang, for example - that moderation and balance in all things is the best route to true happiness. See: SYBARITE, VOLUPTUARY.