What does it mean when a rabbit rolls over on its belly?

Is this question - what does ti mean when my rabbit lays on it's belly? he could be too hot and by laying on the cool floor of his cage he is cooling himself off. Is this question -

what does it mean when my rabbit rolls over and shows me it's belly? The rabbit is a playful creature, almost as much as a cat. He could just want a rub on his tummy.