People tend to adapt to the society in which it is located - is his natural subconscious desire. The longer he is in the company of the same people, the more it takes over their behavioral responses, ways of expressing emotions and emotions themselves, as well as general background mood. After long term spouse completely assimilated, adopting the habits of each other. Unfavorable initial factors that are present in one of the partners may be taken over or locked by another partner in the same neutral and positive similarity is maximized.
As a general rule, if the partners live together for a long time, their appearance takes on the features specific to the climatic zone - for example, living in a warmer climate for a long time, both will face chapped and tanned provided systematically finding the fresh air. Adopting habits and lifestyle, they acquire a similar physique, accumulating or dropping body fat.
The similarity in facial wrinkles and figure also explained very simply. Joint experience - grief, joy, loss and disappointment imprinted on the faces of both, of course, if they were weathered together. Subconscious copying facial expressions by each partner, coupled with joint experiences form the person that over time more and the more similar to each other.