This is a protective hood of skin that covers the clitoral glans. There is no standard size or shape for the hood. Some women have large clitoral hoods that completely cover the clitoral glans. Some of these can be retracted to expose the clitoral glans; others do not retract. Other women have smaller hoods that do not cover the full length of the clitoral glans, leaving the clitoral glans exposed all the time. As in the male, sticky bands of tissue called adhesions can form between the hood and the glans, these stick the hood onto the glans so the hood cannot be pulled back to expose the glans.
Women with larger hoods can often masturbate by working the hood to and fro over the clitoral glans. Women with more compact structures tend to rub the clitoral glans and hood together as one item. Sometimes the glans clitoris is too sensitive to be rubbed with the hood fully pulled back.
During sexual stimulation the hood protects the clitoral glans, from coming into contact with the male penis. The clitoral glans must be lubricated to allow the hood to slide over it effortlessly during sexual stimulation, and this lubrication is normally and naturally provided by sebum. If a woman's clitoral glans isn't lubricated the hood may not caress it during sexual stimulation, or she experiences pain rather than pleasure, as it may feel like sandpaper is being rubbed against her clitoral glans even when the lightest touch is applied.