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The best lubrication for masturbation is the human foreskin. The highly innervated, erogenous, internally-lubricated foreskin is secured only at each extremity and is not attached to the underlying shaft of the penis. It is internally lubrication with lymphatic fluid and glides up and down the shaft of the penis without friction. The foreskin is filled with pleasure nerves that are stimulated by motion. This makes it ideal for masturbation.
Circumcision de-foreskins the penis, shortens the available skin and makes the residual skin taut and immovable. Nineteenth Century doctors thought that would make masturbation impossible. It did not actually make it impossible but it made it harder to do and less fun.
If you don’t have a foreskin, then you will need external lubrication to compensate for the loss of your foreskin. You will need to learn to slide your hand up and down the shaft. Some males purchase a personal lubricant, which is designed to provide lubricant for sexual intercourse. Others may use petroleum jelly, such as Vaseline (which is greasy), baby oil, vegetable oil, or saliva. Some foreskinned males also like to use lubrication, although it is not strictly necessary.
Products with harsh and irritating chemicals should be avoided. Shampoo and body wash have been reported to cause irritation.
Soap dries out the natural oils so it should be avoided as a lubricant. It should be used only in an emergency.
Foreskin-deprived males who try to masturbate without lubrication are likely to suffer friction irritation and pain.