As we’ve previously written, people tend to pair up romantically with partners who are about as attractive as they are. So the most attractive people pair up with each other, followed by the next most attractive people pairing up, etc., all the way down the attractiveness scale. Scientists call this assortative mating.1 How do we know this assortative mating occurs? There is a correlation between two partners’ levels of attractiveness. This means that as one partner’s attractiveness increases, the other partner tends to be more attractive as well. People want the best partner they can get, and the more attractive a person you are, the better mate you can snag.
Although we do have some scientific evidence for assortative mating, this phenomenon really only makes sense when it is very clear who the most attractive people are. And this is not always the case.