A pretty informative answer, (although I'd never thought about how the movies were the first to officially 'ship' Iceman with Kitty Pryde, before). However, I remember rumours about Iceman being gay long before Chuck Austen's run. The first time I read about this odd little rumour was way back in 1997 when the Age of Apocalypse was being published. Even back then I thought I knew the character well enough that it surprised me.
"This was all due to Austen having Northstar crush on Bobby. Nothing ever came of it, and it hasn't been referenced since. Overall, Iceman has been with quite a few ladies now. Mystique, Polaris, Opal and apparently Firestar. And that is just 616 Canon. In other universes (Ultimate/Movies) he has been paired with Rogue and Kitty (My personal favourite pairing for Iceman). So yeah, Bobby has been consistantly straight, and looks set to stay that way, "
Yet despite the list of beautiful women he's dated (as well as the unrequited loves), the rumours about Iceman being gay have persisted. They've even spilled over into television, with a sketch on Family Guy.
So... why? Did something happen in the past? Was there a close encounter of the boy-on-boy kind that I missed? A little innuendo? How & when did these rumours first start?? Would people prefer him if he really was gay? Just what is it about Iceman that these rumours continue to surround him?