For me, it completes the package. Babies do both, so do I. However, I'm surprised to hear that some consider it naughty. I don't at all, in fact, I feel more innocent if anything. Pretending that I am unable to control myself like a toddler just seems so innocently blissful. Messing diapers is an extension of that for me. When you allow it to push out naturally, you get that innocent feeling of "going with the flow." At least that's how I see it. It's pretty cool then to play in your messy diaper briefly before changing time. It's like a trophy.