are all married men cheating?

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I was just wondering about this issue since there is a popular school of thought that a man cheats atleast once in a life time after getting married. Well the statistics so far show this to be true..what i always ask is what triggers this kind of behaviour if at all a man ended up with the love of his life as his wife.Most men i have talked to argue that its healthy for a man to cheat atleast once to kill the monotony...others say its natural for men to cheat since its in them, whatever it is it leaves one to wonder do women get bored too why is it that they don't cheat quite as often as men or am i wrong any way?.