I am so happy that finding out about asexuality saved you from the hurt that would have been caused by making yourself do something you didn't want to. It's also just Consent 101, but somehow it doesn't seem to apply to aces. I wonder if this is part of the harm caused by the brand of sex positivity that equals sex with empowerment and feminism.

It's also kind of funny that you mention Tumblr as a locus of ace positivity (and that is mostly my experience with it as well), because it's also known as a hive of aphobes and exclusionism. I'm guessing the latter is a reaction to the former--that the growing visibility of aces led to a backlash.