DamnYankee
Loyal to the end
Except in this case we are talking about identical twins that ended up as very similar adults, with one exception- one's gay, one ain't.There are plenty of things that can effect the developing fetus while in the womb. This was stated early in the thread.
It can be something you are born to, without it being strictly genetic. And genetics can even play a part in it, without being the entire cause.