You know, I'm just really bad at guessing what people's genders are on deviantART. There have been multiple times when I've assumed someone on my watchlist was a girl, and then I see something that indicates otherwise; and vice versa. To complicate matters, there are at least a couple deviants I watch whom I believe to be transgendered.
Does it matter? Absolutely not. I don't mind the occasional amusing surprise.
Oh yes, and in case it's not already blindingly obvious, I'm a guy inside and out.