Our DS is almost 5 and we didn't get him circumcised.

I think Onyx is right there will always be something that sets your son apart from his peers/friends. Perhaps he will be taller, his hair will be blonder, he will sing better, he will be a faster runner or have 2 different shaped ears, have big feet....the list really is is endless.

Don't worry about how his penis looks and he won't either. If it's something you/your DH wants for your son then go ahead. It's your decision.