I know it doesn't sound like something you want to do to a cat but I know some really like this while others will give you the evil eye if you even think about it! My one cat will just roll over on her back when you come up to her so you will scratch her belly. She loves it. Does yours?
I've had a lot of cats over the years and believe it or not, some have loved it while other did not, at all, like it. I do have two now that just love it when you do this.