If you get turned on by it, doesn't that mean that you are not, in fact, asexual? Isn't it rather a matter of you being turned on by something different than most people (outside of this forum, I mean)? Just because you're not interested in "ordinary" sex doesn't mean you don't have any sexuality that can be expressed in other ways.
That being said, I do understand what you mean. I don't have much interest in vanilla sex either. I'm not completely non-receptive to it, but generally speaking, tickling (especially foot tickling) is more appealing to me. And when I think of or notice women that I find attractive I mostly think of them in terms of feet and/or tickling. Actually, most of the time, when I spot a girl that looks interesting I usually don't think "Damn, I wish I could get her in bed" as much as "Damn, I wish I could hire her for one of my tickling videos".