Until this point the only use you had for your dick was taking a piss. But the soft little slug is about to morph into an unpredictable beast with a mind of its own. Dicks can either be circumcised or uncircumcised.
The difference is the protective foreskin is cut from the tip of the penis exposing the glands. Circumcision can be done for religious purposes, but it is rare to happen these days (and rightly so, who wants their dick cut off?).