[Munchalot]

I agree, from those pics Ploppy does seem to have acquired some wee hammy nuggets down there. :L

I don't think there is much difference. You may notice a stronger smell, as boys have a more active scent gland. Which also means they do get a bit of a greasy belly, and his wheel and the rim of his bowl may feel waxy where his belly has rubbed against it.
I wash both of these for my boy every now and again, because they get a bit gross.

Other than that, I think there is little difference. Males may tend to be a little more docile, but then I've known some pretty crazy dwarfie boys so that really depends on the ham!