Multi-axis scripts & robots

This is an issue that hasn’t been brought up before, although it has been on my mind from time to time - the safety of sex robots.
Theoretically, like any robot, there should be a special lockable “stop button” which, when pressed, stops everything.

And mechanically there shouldn’t be any parts that can cause damage. I have thought about it in the context of my prototype and decided to add a button on top and make the sleeve cup mounts on magnets, , like on the delta 3D printers.