I think it would be awesome, and i would trust myself, no problems there.
having someone around with the EXCACT same skill level and mindset would make competitive and cooperative multiplayer games sooo awesome.
it would be a problem with my/our girlfriend, unless she had a clone as well. though it would probably be the only guy i would share her with, seeing as he is me, though i'm not really sure about this. I think she would like it though.
As for the masturbation thingy, no i wouldn't do it, whether its gay or not, i'm not turned on by myself. I wouldn't wanna swap porn for a mirror.
But other than se girlfriend thing it would be awesome. beeing of the same excact mindset we could probbaly communicate very quickly and efficiently when playing games, and other stuff. I would probbably go find anotyher job that could make more use of this.
Also, we could do guitar battles, which would be awesome
i would like to try to make things the same for both of us, like get a job where we could work togeather, and live togeather, and have the same friends. That way we would remain very much the same, and be able to keep the hive-mind like connection which would make it awesome.