See my message to explain my apparent new status. Or see my posts to decide if I’m a credible longtime Freeper who might have a good reason for a new account.
I don’t think this is the place to go into detailed sexual technique, but to summarize: Uncircumcised men have the choice of intercourse with or without retracting the foreskin, each creating different sensations, and one necessitating more lubrication than the other. The natural foreskin protects the glans, and some believe this preserves its sensitivity that may be dulled if the glans is exposed to friction with underclothes in daily life. Also, the foreskin contains ample nerve endings capable of providing pleasurable sensations, and these are eliminated by circumcision.