The skin that covers the cock head, when the penis is soft, not stimulated enough for erection.
A double layered fold of skin over the penis. The underside is more of a membrane, that is slick and allows for the easy retraction of the skin over the penis head, and shaft. It also is used to protect the penis.
This also generates a natural lubricant, that eases the movement of the penis during intercourse.
No definite study has shown if a person has or doesn't have a more pleasurable sexual experience if they are circumcised or not. However, there is evidence to support the claim that intercourse is easier, requiring less physical force, for penetration.
There is also some support of the notion that the penis head is more sensitive, due to the presence of foreskin. The claim is there are more sensory cells located in the ridge band, at the tip of the foreskin, as well as along the skin covering the penis.
The foreskin begins formation after 8 weeks after fertilization, and generally completes by the 16th week. At the beginning, the foreskin is actually fused to the penis, but gradually separates, but not always.
Initial exposure of the head can be a painful process, until the head becomes more accustomed to air, without its protective covering.
History (Legend): It is a myth that when a male is fully aroused, that the foreskin completely retracts. In many instances, the foreskin can remain covering the head, or partially covering it, even though the male is fully erect, and aroused.
Pulling back the skin, to expose the head and then subjecting it to touching, caresses, oral stimulation, is supposed to enhance the feelings by the person receiving the attention. In some instances the foreskin will retract fully, partially, or not at all.
Use of creams can help reduce the tightness, as well as increase the sliding motion of the foreskin. It can also help in increasing the sensitivity of the exposed head.
Practice (Associated Acts):
The presence of foreskin is believed to make intercourse less forcible, and more pleasant by its natural reduction in friction, that is generated by the penetrating motion. This is believed to be due to the gliding motion of the foreskin, enabling the penis to penetrate with less force from the inner lining.
Noteworthy: Foreskin retrieved from newborn babies after circumcision is used to regenerate human skin, and is used in Medical Labs for testing and learning of the human cell structure.
In several studies, men who were circumcised appeared to take longer to ejaculate, and have less instances of erectile dysfunction in older ages. At the same time, the results are conflicting, in that some claim that delayed ejaculation is a detriment, while for others a form of sexual prowess, and pleasure.
Some studies, notably the 2000 Szabo and Short study, claims that the presence of certain cells, found in the foreskin can be receptors of the HIV virus, or its transmission. It is a controversial finding, as they recommend circumcision as a preventive measure, to eliminate the risk of HIV infection.
However, in 2007 de Witte et al made the claim that these cells produced a substance that actually blocked the transmission of HIV.
There are associated conditions peculiar to those with foreskin. These conditions range from where the foreskin isn't long enough to fully retract, causing pain or discomfort during intercourse. It can also lead to tearing of the skin. Other conditions exist where the skin becomes infected, or gets lodged underneath, causing swelling as it cuts off the blood supply. [see Paraphimosis, Phimosis, Frenulum breve]