Blather, rinse, repeat

Along those lines! Because you actually do manipulate the buttocks--like, a lot--with your tool. And your tool has to be in a certain position. Then you rotate your tool around the buttocks* and down the thigh etc.

ETA I can't even tell you how many times I heard the phrase "Your tool is in the wrong place" or "move your tool a little anterior" and such.


*Glutes. But still.