You want simple evidence, ask anyone who has a foreskin to pull it back and walk around like that and he'll tell you that his glans is too sensitive to do that, well that and that 50% of all nerve endings are in the foreskin.
Actually this is the truth ( for me also ). As far as the dirty part, well they do make this new stuff called soap and water. When mixed together it cleans remarkably well. I realize for some of you this may be new ground. Try it it really works.
The only ones that have issues with health, infections etc... are those that do not wash properly.
All of you that have been butchered, well you have no idea what it is like with a complete penis. Once it is gone ... it is gone. You guys act like it is an abnormality or a strange growth. No it isn't, it is supposed to be there.
From netdoctor:
Should we avoid circumcision?
The foreskin is not simply a useless piece of skin, to be disposed of without careful thought. It forms the covering of the head (glans) of the penis in men and the clitoris in women. It is very rich in nerves responsible for touch and the movement of the foreskin backwards and forwards over the glans provides some of the pleasurable sensation experienced during sex.
Adult males that were circumcised as infants do not usually report sexual problems linked with their circumcision, perhaps because they have never experienced sexual sensation with a foreskin. However, men circumcised as sexually active adults quite frequently complain of sexual problems arising from either reduced or altered penile sensation.
Complications of circumcision
Happily, complications of circumcision are relatively rare, although they may be under-reported following religious or cultural circumcision. For this reason, figures on the rate of complications may not be reliable. Complications include:
reduction in penile sensation (an almost universal experience)
bleeding
damage to the urethra (urine tube in the penis)
amputation of the glans (rare)
infection in the blood or septicaemia (rare).
Conclusions
Circumcision remains a controversial procedure, as it has been for thousands of years.
Male circumcision is vitally important to some religious and cultural groups. Hopefully, the use of general anaesthesia for infant circumcision will increase. Medical and religious authorities should work together to promote this change.
Very few absolute medical reasons exist for circumcision, and no reasons exist to justify routine circumcision of infants outside areas with a high rate of HIV infection. Far too many circumcisions are performed without good reason in Europe and the USA. The best advice is 'if it isn't absolutely necessary, don't circumcise'.
Paul M. Fleiss, MD
What Are the Foreskin's Functions?
The foreskin has numerous protective, sensory, and sexual functions.
Protection: Just as the eyelids protect the eyes, the foreskin protects the glans and keeps its surface soft, moist, and sensitive. It also maintains optimal warmth, pH balance, and cleanliness. The glans itself contains no sebaceous glands-glands that produce the sebum, or oil, that moisturizes our skin.11 The foreskin produces the sebum that maintains proper health of the surface of the glans.
Immunological Defense: The mucous membranes that line all body orifices are the body's first line of immunological defense. Glands in the foreskin produce antibacterial and antiviral proteins such as lysozyme.12 Lysozyme is also found in tears and mother's milk. Specialized epithelial Langerhans cells, an immune system component, abound in the foreskin's outer surface.13 Plasma cells in the foreskin's mucosal lining secrete immunoglobulins, antibodies that defend against infection.14
Erogenous Sensitivity: The foreskin is as sensitive as the fingertips or the lips of the mouth. It contains a richer variety and greater concentration of specialized nerve receptors than any other part of the penis.15 These specialized nerve endings can discern motion, subtle changes in temperature, and fine gradations of texture.16, 17, 18, 19, 20, 21, 22, 23
Coverage During Erection: As it becomes erect, the penile shaft becomes thicker and longer. The double-layered foreskin provides the skin necessary to accommodate the expanded organ and to allow the penile skin to glide freely, smoothly, and pleasurably over the shaft and glans.
Self-Stimulating Sexual Functions: The foreskin's double-layered sheath enables the penile shaft skin to glide back and forth over the penile shaft. The foreskin can normally be slipped all the way, or almost all the way, back to the base of the penis, and also slipped forward beyond the glans. This wide range of motion is the mechanism by which the penis and the orgasmic triggers in the foreskin, frenulum, and glans are stimulated.
Sexual Functions in Intercourse: One of the foreskin's functions is to facilitate smooth, gentle movement between the mucosal surfaces of the two partners during intercourse. The foreskin enables the penis to slip in and out of the vagina nonabrasively inside its own slick sheath of self-lubricating, movable skin. The female is thus stimulated by moving pressure rather than by friction only, as when the male's foreskin is missing.
The foreskin fosters intimacy between the two partners by enveloping the glans and maintaining it as an internal organ. The sexual experience is enhanced when the foreskin slips back to allow the male's internal organ, the glans, to meet the female's internal organ, the cervix-a moment of supreme intimacy and beauty.
The foreskin may have functions not yet recognized or understood. Scientists in Europe recently detected estrogen receptors in its basal epidermal cells.24 Researchers at the University of Manchester found that the human foreskin has apocrine glands.25 These specialized glands produce pheromones, nature's chemical messengers. Further studies are needed to fully understand these features of the foreskin and the role they play.
Good luck all you half dicks!