I would say it depends. I have an extremely narrow range in male physical appearances that appeals to me. If that isn't met, it wouldn't matter what they were like or how close I was to them otherwise, I would be completely asexual with them. On the other hand, with that type, I would say I was very sexual with them as I was very sexually attracted.
I find it interesting the person who said the sexual attraction went away in a long term relationship. I realize that is true of NTs since I hear it so much, but I hadn't really thought of it being an issue with an Aspie. I guess for me (and probably my partner), sex is as much a mental experience as anything. What you try, what you can try and what you can try next. It's also, for me anyway, an artistic endeavor. The two, art and physical contact, are very tied together. Perhaps it takes two people being in that same place?
Now, by the same token, I absolutely cannot stand to be touched by almost all people, even in a friendly way. It unequivocally gives me the creeps when people touch my arms or hug me.