The clitoris is naturally designed to be stimulated with foreskin covering the glans. Touching her exposed glans will actually cause more pain and discomfort than pleasure because the glans is not touch sensitive. This means it won't respond to light touching or rubbing.
Foreskins (of the clitoris and the penis) are touch sensitive; the glanses (of the clitoris and penis) are pressure sensitive. The foreskin protects the glans from uncomfortable direct friction. It also gives the glans pleasure by letting a finger or hand massage it.