Does anyone know why we always have cables that are male to female, female to female, or male to male? Wouldn't it be easier to just have a 'bisexual' connector that would allow one cable to fill all needs? I was thinking of something like this:

With a connector like this cables could easily be connected anywhere, without worrying about whether it's an 'M' or an 'F' port. Moreover, get two cables and attach them end-to-end and you have a new double-length cable, without the need for an in-line coupler. This would be really handy for USB, where sometimes you need a short cable and sometimes you need a long one. You could just have four cables, 1, 2, 4, and 8 feet long and you can make any cable from 1 to 15 feet. You can't even do that with M-F extension cables, because they're only good for extending. I wonder if it's too late for that patent. I'm sure someone must have implemented this but if not, I call Prior Art!