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True, love and sex are (or at least can be) mutually exclusive. So why is a man who is thinking about being unfaithful a "poor example" of a man and a human being?
If sex and love can be seperated, and a man can still love a pregnant wife even though he is having sex with someone else how is that a "poor" example when you insist that sex and love are seperate issues in the first place...
The reality is that marriage is a pointless institution that ignores the basic biology and drives of both men and women.