What is the real reason for circumcision?

Because you ask: Circumcisions are a personal choice common to various religious or cultural practices. They are common to some parts of the world and not other. They are simple and heal rapidly in newborns but become problamatic as you get older. There are some supportive data on uti's & std's. In the end it is a matter of personal choice.

Depends.: Some families choose it for hygiene, others for religious reasons, a few for the slight degree of protection it affords against some of the stds.