Originally posted by StiltmanFTW
Your theory is wrong, because young Iceman met his modern self and they discussed it in detail, which confirmed that he's always been gay.Also, it wasn't much of a surprise.
Come on now this is an X-Men comic and Jean is an incredibly powerful telepath. Those were implanted memories. She put the whammy on both of them and made sure the back story felt totally plausible so that Bobby would accept it not fight it. Implanted memories are commonplace in the X-Men, with half the X-characters having them at some point or other and Jean is nothing if not thorough.
Hell, for a while Captain America thought he was a Nazi. That's the power of false memories.