The Science of Sexual Attraction

SBS Insight posed a lot of engaging topics over the past few years. One in particular is "The Science of Sexual Attraction". From my general observation over the past few years, I have realized that attraction, either recognized as the exterior (viz. aesthetics) and interior beauty (viz. personality including the level of funniness) of a person, is more or less governed by the theory of  "Resemblance". Humans as animals, are genetically programmed to care for those that relate or resemble, which is why we are more likely to put emphasis on caring family , kins and friends. My explanation behind our instinct care for our kins, close friends and especially our lovers is because we instinctively want to preserve or invest in the qualities that we ourselves possess, or qualities we see ourselves in, and by protecting those traits that resembles your own, theoratically a part of you live on.  Given that theory of our instinct behaviour to preserve traits,  it's logical to pursue that when one seeks friends, the usual traits of their friend will in some way relate to their personal stories e.g. ethic background, social status, personal experience.
Appearance nonetheless is key to the preservation phenomenon. My theory being that human are select their partners of friends base on the degree of similarity of the shape and size of the facial features from the centre of the nose bridge to one's chin. If they do not see resemblance there, they'll seek to find resemblance of  facial features that are above the centre of the nose-bridge. Consideration of the resemblance of personality will almost always come after facial appearance has been judged.
(to be continued...feel free to comment!)