I have discussed this a bit before. Some members love switching, seeing one model get spanked, then spanking the other model in a switch scene. Both give and receive a spanking. Others don’t like it. They want to see only one true top and one true bottom in a scene.

There is a fair amount of switching on the 6 sites (Clare Spanks Men is all Fem Dom). And in the case of Spanking Sorority Girls, nearly all of the scenes are switches.
