I, like most men in the US of my time, am circumcised (yes, it is a form of genital mutilation with no proven scientific benefit).
One thing you might forget is that circumcision is not really done on a bay without that baby feeling incredible amounts of pain. Little anaesthetics are used. The wound is hard to 'patch up' so as a result many male babies are most certainly peeing on their wound especially while diapered. Certainly does not help the wound to heal. And the removal of the foreskins removes nerves critical to sexual arousal.
So I think the lack of foreskin and therefore the lack of those very sensitive nerves makes diapers (or perhaps tight clothing too like panties) very appealing. It is like having that foreskin again. It can be very arousing.
Anyone think it's possible?