Thus, there is often a halo effect with physical attractiveness, such that people who are above average in attractiveness are thought to be above average in other aspects as well. Physical attractiveness can be a disadvantage too, however. For example, people who are physically attractive may think that others are doing things for them, praising them, etc. That is, they may come to doubt anything positive anyone else says to them, because they attribute that to their attractiveness, rather than to their self. The third factor in attraction is similarity.
People tend to like others who are similar to themselves.
People are interested in having relationships with others who are similar to themselves. If the goal of attraction is partnership, and part of partnership is sharing your life with someone else, then clearly it is best to choose a partner that has similar interests. It's much easier to share your life with someone who is similar to you than with someone who is not similar to you, because the person who is similar to you will tend to have the same likes and dislikes as you do. They will want to do the same activities as you do. Conversely, if someone does not share the same attitudes as you do, you are probably not going to want to hang out with them.