If we're arguing prepubsecent, then I agree more with kingsypoo than Icy. I won't call it a sickness, but coming even from a strict psychological and/or evolutionary point of view, it's not something that's natural and probably has psychological factors influencing it more than most other sexual desires. However, this argument only works with prepubescent kids, which is why I see nothing wrong with girls 14 or so and up.