Why Do Cats Like Their Lower Back Rubbed. Cats can get pretty rough sometimes when grooming/roughhousing. So, if for any reason they feel the need to defend themselves, they may roll onto their backs.
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They either love the belly rub or hate the belly rub (cat proceeds to wrap claws around forearm, while kicking and biting until you can free yourself from it's belly rub hating vicegrip) all in all, your cat is normal if it goes a bit crazy while you scratch it's back. He'll purr like a kitten, tilt his ears back, and eventually playfully flip over to wrestle/gnaw on my hand. It’s one of their many innate behaviors that cats instinctively do.