"It's an established tenet of social psychology that similarities rather than differences-whether in attitude, personality, age, income, race, or religion-produce a lasting relationship. 'Opposites tend to attract in the short term, but not in the long-term,' says Catherine Sanderson, a psychology professor at Amherst College who teaches a class on close relationships. 'Over the long haul, one of the bigger predictors of success in relationships and marriages is similarity.' (A marriage between people with similar qualities is known as homogamy.) There's less to fight about, for one thing. People from different religious backgrounds might want to raise children in different traditions, or those from disparate economic backgrounds might clash on the importance of education. Agreement, meanwhile—whether on movies, restaurants, religion, or favorite romantic comedies—produces positive emotions and more fruitful relationships. (It's also true that similar people are more likely to meet each other in the first place: If you like sports, you're more likely to be in situations where you'll run into other sports lovers.)"
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