COMMONSENSE is also knowing where to draw that imaginary line between being friends and wanting more..The smart person knows where that is and would hopefully make the right choice to not be friends with that person anymore.
People that engage in Outside affairs do it because of a problem or something that is lacking in a marraige it has nothing to do with having *Friends* being faithful and fidelity is not natural what is is that you make a commitment to someone and for religious reasons to practice monogamy....
Marraiges can grow stale, sour and dis-satisfying especially when there is no children in the house and your with someone who lacks the zest to keep a relationship worth wanting....I also think because women NOW work outside the home can take care of themselves are in good shape good health when they reach there 40's if they are with a man who is just sitting around boring them to death they leave..WHY? because in 2005 they now can and don't have to be in loveless marraiges like most of the women before them had to...