The clitoral hood is the little flap of skin that covers the head of the clitoris (clitoral glans).
It is also known as the prepuce.
See the image below.

The clitoris, or more precisely, the head of the clitoris is covered by the clitoral hood.
The Sensitivity of the Clitoral Head and the Purpose of the Clitoral Hood
The clitoral hood serves as a protective hood to protect the clitoral head (glans).
The clitoral head (glans) is extremely sensitive that the clitoral hood protects it from over-stimulation.
When a girl or a woman becomes aroused, the glans (head of the clitoris) fill with blood and emerge or protrude outwards from under the clitoral hood, though in some women, just barely. Here, stimulation to the exposed clit becomes extremely pleasurable for a girl (or a woman) and thus heightens her arousal and excitement and makes her orgasm sooner.
Now, as the woman or the girl reaches the brink of orgasm, the clitoral head shrinks back or retracts under the clitoral hood to be ‘protected’ against over-stimulation (direct contact by a penis, tongue, or hand) and the ruination of an orgasm. As direct contact at this stage (at the brink of orgasm) can be painful than pleasurable.
So, it is in the folds of the clitoral hood that the head of the clitoris seeks refuge. Again, direct contact at the brink of orgasm can be painful than pleasurable.
The Clitoral Hood, Oral Sex, and The Female Sexual Pleasure
The clitoral hood is an erogenous zone and plays an important role in female sexual arousal.
It is rich in sensitive nerve fibers and is pleasurably sensitive to erotic touch and stimulation.
When a woman (or a girl) becomes sexually aroused via foreplay, the erectile tissue of the clitoral hood becomes engorged with blood, making it pleasurably sensitive to erotic touch and stimulation during cunnilingus (oral sex).
Particularly, a warm wet tongue on the clitoral hood feels amazing to women and produces extreme pleasure for women and have them dripping wet in no time.
Even the smallest lick to a girl or a woman’s clitoral hood will send waves of pleasure throughout her genitals.

Extremely sensitive clitoral heads
Girls (or women) who have extremely sensitive clitorises (glans) to the point where direct stimulation feels too sensitive or intense and even painful may enjoy indirect stimulation to the clitoral head via the clitoral hood.
Here, the friction created when the clitoral hood rubs against the head is a powerful source of stimulation and pleasure.
And there you have it…
…the clitoral hood
I hope this article has given you an insight into the clitoral hood.