For somewhere as dry as NZ (due to winter)... you skin can crack, especially places that stretch.. like butt crack.
U need something extremely moisturising. Try the body shop aloe vera body moisturiser. It is by far the most moisturising body moisturiser i have tried. But you need to use it religiously - after every bath.
Link is below. Best of all, it is for sensitive skins, so its suitable for all skin types.
http://www.bodyshop.com/bodyshop/bro...yId=cat4750003