Why are so many beautiful successful girls happy to be kept women?

Many girls I notice are dating married men, knowing fully well that that the man is married and even his wife knows about this extramarital affair. Who is to blame for this state of affairs? Some of these "second" women are actually successful in their careers and are pretty. They will never have trouble finding a guy that will treat them with love and dignity. Is it better to be alone, with a loving man in a boring relationship, or to a "second" woman in a relationship?

Better to be alone
Better to be with a loving man in a boring relationship
Better to be a "second" woman in a relationship even when his "main" girl knows about you
Select gender and age to cast your vote:
Why are so many beautiful successful girls happy to be kept women?
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