Anon you're doing nothing but inventing a status quo just so there's something to go against. You've simply decided that people feel one way just to make it seem wild and crazy to feel another way, when that's just not the case.
And furthermore, the cases where individuals have actually been proven to feel the way you say they do have always been due to a chemical imbalance or other condition that can be cured, it was not a natural part of them. Hell, even regular aphrodisiacs still work on people calling themselves asexual.
Calling oneself an asexual just seems like the modern day version of wearing a hat to make them feel more interesting than they really are, it's just a shallow fashion statement, especially since you even pointed out that they still have sex anyway.
Anon, despite what you might presume my mind can actually be changed, but I just haven't seen anything proving it to be more than a modern day equivalent to being a hippie wearing tie dye, a fashion statement to try and stand out from other people.