This spanking position was used more in the distant past than in recent times. I borrowed a fantastic spanking book once, with lots of drawings and photos from the 1920s... There were sepia shots of girls on the floor like this, bottoms up... and I wanted to give my 1970s photo a similar feel of abject submissiveness.
It also gives the person with the belt, cane or whatever a good swing at his / her target. So it's not really for play or romantic spanking... More for a severe whipping.