How do you describe Polish couples who are married for 20 years or more?
They make a wedding vow to God Almighty thru sickness and health until death do us part.
Is it true that most of these couples are just staying in marriage even they are unhappy and most of them are sexless in marriage.
No, not true at all.
Sex is just the dessert of a marriage and is not the top priority to make a happy marriage.
In the US we don't take bullshits. We divorce if we are not happy in the marriage.
Not true at all as mature adults know that marriage takes a lot of work, sacrificing, forgiving and understanding.
Marriage is not 50/50, it's 90/10.
The ones that don't choose (in your words, "to take bullshits") to do so are the immature, selfish, weak minded, that have no qualms about breaking their promise to God.
Those people were to immature and not ready for marriage.
Why would someone who doesn't want to work at their marriage and take the easy out with a divorce expect to find any kind of happiness period.
Have you ever heard, "you get out of it what you put into it "?