From Kermit Rose:

Re: Science gives beauty some of its mystery back (Dec. 22): I’ve noted, in myself, that I tend to be attracted to someone who resembles people that I’ve known and liked in the past. Perhaps this is one of the reasons that people tend to be attracted to the average person.

It might also be one of the reasons that people tend to be attracted to variations from the average. And conversely, what ever qualities a person might have to make me attracted to them, might be correlated with their appearance.