i posted this... according to a friend who works in a veterinary office, paddling cats that are in heat is a somewhat common practice, though he never expanded on the "why"
there is also a similar video a little further down the page
We had a cat that loved spankings. He also loved being tossed against the back of the couch. When I was pregnant w/ my oldest son, Ali Bubba (the cat) , would lay across my stomach and then the baby would kick him under the chin. He just purred louder.