>>19517557when you plug something into a wall socket, you are forming a circuit between the electricity carrying wires in the wall socket, and the thing you plugged into it. The thing you plugged into it is generally going to be an appliance or electrical device of some kind, which will draw power from this circuit to operate. ie: you plug a lamp in, the lamp forms a circuit with the wall socket and receives power that lights up the lightbulb. If you make a cord with a plug on one end and a socket on the other, that's fine. You've just made an extension cord that will transfer power a greater distance from the wall socket to something else.
If you make a cord with two plugs, though, the only thing that you can do with it is plug it into two wall sockets(or a wall socket and a generator). That's two things that both supply power being connected together, as opposed to one thing that supplies power and one thing that uses power. That causes the electricity carrying wires in the wall socket to form a circuit with themselves. This is not supposed to happen, and results in unrestricted electrical flow through a circuit that doesn't power anything. More electricity flow means more heat, so doing this generally results in the wiring massively overheating and setting things on fire. Or blowing every fuse and tripping every breaker, in modern systems, because those exist to protect them from exactly this kind of stupid thing. Basically, they won't make them because there's really no legitimate reason anyone would ever want one, and if they think they do they've probably misunderstood something and would burn their house down if you gave them one. The only thing they're good for is breaking electrical systems, which is not something you want to help people do.
