One butt cannot penetrate another butt. Therefore, you must surgically turn one butt inside out so it can fit another butt inside of it. Then, insist that the surgically inverted butt is actually a very comfortable chair and call the owner of the right-side-out butt an intolerant bigot for not wanting to sit in a chair made of an inside-out butt. If you do this persistently enough for a long enough time, society will start believing you can make a chair by turning someone's butt inside-out with surgery.