It's a sleeve of skin, which goes from the penis shaft, and covers the head of the penis, with an opening at the end. When you are a baby, it is attached to the glans, usually. It keeps urine and feces away from the head when a boy is an infant, and prevents uric acid from burning the urinary opening and glans. It keeps the head moist, supple, shiny, and sensitive, until it is meant to come out for sexual contact. It has 20,000 or so very responsive nerves.
It slides back and forth during sex or masturbation, and makes intercourse gentler for both sexes, no lube required. If the woman is not lubricated, you can pull the foreskin up over the head, insert the covered head, give a gentle thrust, and you're in, with no discomfort to either one. It feels like a pair of lips, when it goes over the glans. A foreskin is the softest skin on a human body. A woman has one, which covers her clitoris, until she is aroused.
The reason you see so many posts here, from guys who have foreskin problems, is that men used to talk about these things and get them resolved. They are easy, once you do. Now, they turn to the anonymity of the internet. Whatever works.
| 
What exactly is foreskin 
Linear Mode
