(Mutant)
It's a natural genetic selection, we don't realize we are doing it, we just do it. sometimes its from someone pleasant we remember from our past, but for the most part its a subconscious genetic selection.
females do this as well, subconsciously looking for a good healthy male that will help provide them with strong healthy children and help protect and provide for them.
Aspies for the most part seem to go beyond this looking into who the person is, but still looks and health and age seem to matter much, if you do not think so then go out and watch the people passing by you in the streets and malls and without knowing them ask your self if your attracted to them, then ask your self why, and ask your self why you are not attracted to the rest.
Just remember, not all people are the same, what you may find attractive others may not, its all in the mix, thats why theres someone for everyone, if you can find them.