Also I'd be curious to know how many gen and het fans are queer, if only as a control, but that's just me ^_^

Actually, I think that it would be really interesting to split out m/m, f/f, m/f, poly, and gen fic. Part of the stereotype is not just that slashers are all straight women, but that slashers prefer m/m slash exclusively, or consider it to be "more interesting" than other forms of fiction.

As someone who identifies as a slasher but enjoys fiction of all stripes, this makes me grumpy. And I've love to see some numbers.