yah, i would take one of the stems and train it in a clockwise circle, and take the other stem and train it in a counterclockwise circle, and just keep circling one above the other when it gets that big, would look pretty sweet and would get a lot more light ...
i'm dying to see how this is going to turn out.. when i first read the title, i had thought that you had meant you had twins, which i've seen more than one time, some of subcools gear does this quite often believe it or not, but than when i saw your pix, god damn, lol, never saw that before...
and i agree, it's just something in the genetics of the plant, some kind of mutation, who knows, maybe it came from japan, lol..
you never know though as some mutes can be really killer, and others, well, not so much.. keep your fingers crossed and take care of it and see what you get from it.. and i agree with what someone else has said, even if it's a male, i'd try and keep it around if you can and try to get some pollen from it and make a cross or two with the freak, and see if the mutation passes off to any of its offspring or not..