Often times we find ourselves attracted to people at first sight, but have you ever thought of why this really is? Yes, it's obvious they're attractive to us, but what truly drives attraction? Researchers are finding evidence that attraction is a biological concept rooted deep in our mind that we subconsciously perceive. The Discovery Channel did a television series called the Science of Sex Appeal, which analyzed many different ways in which we perceive beauty, one of them being the Golden Ratio. In the video below there is an excerpt from this series talking about the Golden Ratio and talking about the software that can be used to calculate the beauty of someone's face using this ratio. A perfect score being a 10, about a 5 is average when rating a person's face and anything over a 6 is usually considered attractive. Our mind subconsciously computes this with every person we meet, rating their general attractiveness. Another way we calculate beauty without thinking (also shown in this video) is by the masculinity or femininity of the face. A face a female perceives is usually considered more attractive when it's masculine and has a wider and longer jaw, and thicker eyebrows. For men it's the opposite when they're attracted to women.
So why are these rules of attractiveness important? Our brain calculates beauty because the more beautiful a face is, the more likely it is that their genetics will also be good, so this is an Evolutionary trait that's been forming so that the human species can benefit from reproduction. If every person in the world was found attractive, some bad genetics would be passed down, causing negative consequences for the species over time.
So now next time you see a person who you find attractive, you can now know exactly why this happens. Maybe think to yourself about the masculinity of femininity of their face, or how symmetrical they were. Things like this are very important in person to person attraction, and there is a deep biological need for them.