Sexy has layers. There is temptation, mystery, instead of getting everything at once you get to unfold layers of desire, one by one, mystery by mystery, desire by desire. It is like a fine meal, with layers of flavor, color. texture and nuance.

Slutty is in your face, leaving nothing for later, nothing to savor and nothing filling or desirable. Sluty is a cheap hamburger, that is barely filling and lacking in taste.