Keep in mind, not all children are 4. I have one "child" that is 21. My other is 7 and doesn't 'pee' in the pool. All that aside, the adult areas, pools, lounges, whatever, are adult areas. I do not allow my children (except the 21 year old, as he is an adult) into the adult areas. I have respect for not only the rules on board (and everywhere else for that matter) but respect for the other passengers. If people want or need or desire activity in an adult area, who am I to trespass on that. There are plenty of areas for the kiddies, I let my youngest go there.