Why is this question for men only? Are women not allowed to cheat equally or does that just make them a whore or a slut in the male reptilian brain?
If you can't stay faithful to one women what the fuck are you doing in a relationship. Cheaters don't BELONG in relationships and the ones that do are sociopaths who don't give a shit about anyone but themselves. Do everyone a favor and stay single. For every supposed swinger or open relationship that people claim to be successful there are many who aren't and only end in heartache for everyone but the selfish bastard who initiated it.
I feel sorry for the kids who grow up in these type of homes because lets face it, what an awesome lesson they are learning on how to treat people.

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"The towers are gone now, reduced to bloody rubble, along with all hopes for Peace in Our Time, in the United States or any other country. Make no mistake about it: We are At War now -- with somebody -- and we will stay At War with that mysterious Enemy for the rest of our lives." H.S.T. 09/12/01