Circumcised ones are more aesthetic or so I've heard. Plus there's an exotic-ness to the 'other', similar to the fetish for black men in America and North African men in Europe.
Ok. I'll take your word for it.
Personally I've found no difference in the female versions - Hindu, Muslim, Christian, Sikh and Parsi girls.
That's more my area of paraclinical expertise.
Cheers, Doc