Men or women which are mosre unfaithful ?

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I am realy confused and out of logic in this matter. The mass view may be men are more unfaithful and have more outward nature. Apparently it is true. I also indirectly experienced this thing in my friend circle. (hey not me ok. I am engaged since 5 and half years) But recently women are not behind it any more. And they are producing very much killing blows also. I cannot find any logic or equation behind it. All those life mathematicians, have you got any answer of this ?