I don't know why, honestly. He always just pinged me that way. I always knew she wasn't going to make him canonically gay, because when you have a metaphor, you don't make it into the thing it's a metaphor for, and I always saw his being a werewolf as a metaphor for being a gay man with AIDS. There are a number of possible readings - the lycanthropy is mostly a symbol of The Other - but the trappings always struck me as being that. And I think Cuaron certainly played that aspect up in the movie, though I don't actually *like* the characterization of Remus in the movie at all.

And possibly because I always, always saw the Remus/Sirius subtext, from the first time I read PoA, long before I was slashing anybody.