I was told by one Dominatrix in London, who did it because the money was better and easier than working on her back not because she was in to perverted sex, that she always bent her slaves over a horse or bench so they could not wriggle or move. This way they always had their buttocks exposed and ready for a good whipping, caning or spanking. So why she did not bend him over something I don't know as she would not have had to keep asking him to put his buttocks out to receive the cane.
I don't want the caning but I certainly want to shag her ruthlessly in every hole of her voluptuous MILF body. I would show her no mercy until she alternatley screamed with pleasure and pleaded for a rest, especially as I fucked her full buttocks and plunged ruthlessly up to my balls inside her tight arse hole. This is one quality piece of MILF, on the cusp of mature, fuck meat.