Why do few men lose interest in their wife?

I have seen few men who lose interest in their wife after some time or their marriage. Why is it so?I believe when they get married, they take an impulsive decision without knowing each other's interests and likings, just considering the physical beauty, and when they get bored, they try to find someone else for them. That's the reason I say people must not consider physical beauty to make a relationship. What do you say?
 
It seems those men get too comfortable. The early spark fades and if both partners do not put effort, things will fall apart quickly. Life stress also play a big part in this. Work, bills and other stress are the culprit here. But honestly, communication helps a lot. Some men just withdraw instead of talking. I’ve seen couples that found the spark again just by spending more time together. It has no magic formula, it just take effort and patience.
 
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