Grapes are perhaps the most perfect of all fruits. They're so easy to eat too, you just pluck them off and chew. There's no business of peeling or removing seeds. There's something quite decadent about eating them off a bunch. It brings visions of Arabic princes surrounded by houris, puffing smoke from hookahs while being fed grapes.
And look at the structure of a grape, especially the long waxy green ones we see. Faintly blushing, they have incredibly taut, delicately thin skin. They're the perfect size too, to just fit in your mouth one at a time. Then when you bite, the skin explodes in a positive eruption of sweetness, with just enough tartness to make you smack your lips in delight.