I've been wondering about this phenomenon. I mean, granted, the Supernatural fandom is largely comprised of a very loyal, very rabid, very horny female following. So when you tell them," Hey, there are these two hot guys with loads of inner emotional conflict and trust issues, living on the road as fugitives, alone in a classic Impala," it naturally follows that they will immediately whip out their porno slash fantasies. However, what they can't seem to factor in is that they are BROTHERS. As in that their rough-and-tumble love for each other are more of the Hardy Boys kind than the Brokeback Mountain type. (Incidentally, I wonder whether they write incest in the Hardy Boys fandom?)
I blame it on the fact that so many people are only children these days. They can't see that the constant "bi***-jerk-freak-shut up-wuss" banter between the brothers denotes not UST but a fraternal love song.
I also blame Arundati Roy. Not all roads that stem from childhood trauma lead to eventual incest.
Oops. Totally OT in my own thread.