I think that hit the nail on the head...it's the "shudders" ...sexual behavior of a tot that's just plain sick.
No other child activity I can think of has that particular component. The only one that I admit may even come close is cheer leading, but it's nowhere near the extent of these pagents and the kids involved aren't toddlers.
And its so demeaning to women. Its basically raising a child, from before they could walk, to embrace that the most important thing they can do is to be sexually appealing above all else.