Another important element of attraction is easy to understand: it is similarity. This means that two people feel that they are--more or less--the same. In a number of different studies psychologists found that people are more likely to choose friends and partners of the same age, race, class, and with similar opinions. This is because people who are similar feel more confident around one another. They feel better about themselves. In Peter Todd's speed dating study, both men and women said that similarity was most important in choosing a partner.