Answer:
That is like asking do you have to have earlobes or a nose. The answer is yes.And you should have a foreskin. You can live without one and there are qite a few peole that live without one. never the less more then 80% of the men in the world chose to keep their foreskins. of the les then 20% remaining that are circumcised most had this done to them while they were either new borns or children with litlle or no say in what is done to them.
There is no medical necessity to have a foreskin however we did evolve to have one because they are benficial.