The majority of the fics I've found annoy me just because it's like the character is asexual in name only. They'll say "this character is asexual" at the beginning, and then go into the porn, with zero discussion, or the slightest indication that the "asexual" character isn't really into it, or anything. It's...weird.

I don't think I'm asexual myself (although honestly, I'm not really sure what I am; the only thing I'm positive I'm not is a lesbian) but I find it interesting, and I wish I could find some well done fics for a fandom I'm into.