There are many reasons why circumcision is NOT a good thing. Since this is the "sex support" forum I'll give the "sexual" reason why....the removal of the foreskin exposes the head of the penis which over the years becomes desensitized from all the contact it receives on a daily basis. Un-mutilated men enjoy a higher sensitivity in that specific area.
The argument of Cleanliness is bogus. If you practice regular hygiene...shower or bathe regularly...you're good to go. My older son has NEVER had a problem...he's 21. Neither has my husband...he's 45. It is totally natural and is a definite turn on.