The problem is your asexuality puts a hole in your life. You don’t form normal relationships. Then, when you start to feel fleeting lust, for whatever reason, you need some way to quickly deal with it. You are on the computer too much, and it seems exciting at the time. Then, later you regret it, when you are no longer in the mood; and sex seems so gross again.
I believe that asexuality is an illness. The difficulty is in finding what stressor or chemical imbalance is causing it, and how to solve it. I felt totally like plastic for years, without understanding why.
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