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| Text=The male foreskin is a part of the [[skin ]] of the organ and fulfils important functions that protect the very sensitive glans. It normally covers the glans and protects it from harmful substances, friction, drying out and injuries. It has apocrine sweat glands, which produce cathepsin B, lysozyme, chymotrypsin, neutrophile elastase, cytokine, and [[pheromone]] such as androsterone. Indian scientists have shown that the subpreputial wetness contains lytic material, which has an antibacterial and antiviral function. The natural oils lubricate, moisten and protect the mucous membrane covering of the glans and the inner foreskin. The tip of the foreskin is richly supplied with blood by important blood vessel structures. The foreskin serves as a connective channel for many important veins. [[circumcision]] can lead to erectile dysfunction as it destroys these blood vessels. Their removal can, as described by many of those who have been affected, lead to considerable limitations to sex life and cause psychological stresses.