>You are more likely to marry, be friends with, get along with, etc people who have similar interests and appearances to your own. This may sound like common sense but for a long time people assumed that “oppposites attract”

>This principle holds true in literally every single society we have studied ever. Even primitive societies hold true to this. My favorite explanation for this is that there’s less cognitive work involved in meeting similar people and thus you’re able to move through beginning stages of a relationship much sooner.

I put it down to the familiarity principle which states people tend to develop a preference for what's familiar so people will automatically feel a person is more familiar if they have features and traits they recognise in themselves.