There’s a reason why we are attracted to certain people of the opposite sex. According to evolutionary psychology, what we want is healthy mates. Beauty, for example, is a way in which we have of judging the health of another person. The theory says, for example, that if you are at a bar on Friday night and you want to “pick up” somebody rapidly, you can’t do a blood test. You can’t do a physical examination to find out how healthy that person is, so you need markers.
According to evolutionary psychology, the markers are for estrogen and testosterone - shown in the body by beauty and physical health. For example, estrogen has estrogen markers: large eyes, small chin and thick lips. Same thing with testosterone: testosterone makes large necks and strong jaws and a lower voice. That also means the person is fit; the person is healthy. These are markers that we use.
Interesting story by Michio Kaku
Read the story:http://bigthink.com/videos/why-were-attracted