Humiliation Being put over the knee is a childish, humiliating posture. Having to 'assume the position' is humiliating in its submission and rubs in the fact that they are being spanked. Exposure A properly positioned bottom is fully exposed. The cheeks are fully presented and split, their undersides turned up. In the case of men, the anus and back of scrotum show.
Women are even more exposed, their rectums and vulvas fully visible.
Emphasis on their bottom Spanking positions place the center of attention on the bottom of the person being spanked, a fact not lost on said person. The bottom is emphasized by its exposure and upturned position relative to the spanker. Presentation of their bottom Not only is the bottom exposed and emphasized but the spankee feels they are willingly 'sticking it out' and presenting it for its punishment in the same way that the condemned man must place his head on the chopping block. The spankee knows their bottom cannot evade or escape the swats. Submission Cooperatively getting into position to be spanked is the primary act of submission in spanking.