How do you define sexual attraction?
I know this is probably trying to stir up shit, but I am going to pretend you are legitimately asking to learn.
Sexual attraction is, (aside from being hard to describe since I don't experience it) easiest (for me) to decribe as being horny in a direction.
When a person is attracted to another person those "that feels good I want that" feelings are pointed in the direction of "that feels good I want that With Them"
Like, you can eat without being hungry, or kiss without romantic or sexual intention, and you can have sex without being horny in the direction of the person you are having sex with.
Idk, I am definitely not the person to ask if you want a better example, and there are absolutely bigger better already posted explanations, but I actually wanted to try to answer.