Hey y'all,
I am starting to see your point, as fetishes make things very difficult and weird in terms of sexuality. I think a major thing isn't that an asexual person can't get off or can't have sex, but it is more they aren't sex-focused. The goal when being with another person is never to screw them. Physically an asexual person can (potentially) have sex. there is nothing stopping them (aside from potential medical reason). it is more a mentality that it isn't the goal or necessary.
On the Asexuality.org under Arousal, I think this line explains it the best "Because we don’t have