That's a lot of it. Like sex is also just a good way to acheive intimacy with someone you care about.

The big thing for asexual people is how you view people you aren't already attracted to in other ways. Most people can find people they barely know sexually attractive. For example celebrity crushes or finding a certain porn model hot. For an asexual person that is a foreign concept. I've never seen someone and desired to have sex with them because of how they look. It's not that we don't know when people are good looking but we don't really feel anything towards them just because they are. That's also not to say asexual people never watch porn it's just that when we do it's about the act taking place not the people in it.