Where it comes from
Oil massage is the oldest tool in the drawer, the Greeks oiled and worked the body at the baths, and the strokes taught in every European school since Ling's Stockholm curriculum are built for exactly this medium. What the erotic version adds is not a new stroke but a slower register in the second half, named plainly on the menu rather than hinted at, and the format has never needed improving since: good classical work, taken at an unhurried pace.