Experts explain that there are mainly three reasons why couples often tend to resemble each other. 1. A couple has same eating habit and routine. Therefore, their figures will gradually resemble each other. 2. When people choose their partners, they tend to find someone who is similar to themselves in appearance. 3. People tend to imitate those who are close to them. After a couple lives together for a long period, their movements, expressions and temperament will gradually become similar to each other.