Sounds like a pretty dumb idea to me. If it's just a fling, then I guess you can do whatever you want. If you're looking for a real lifelong partnership, I can't see a scenario in which a 4-way doesn't end up messy.
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your flawed paradigm is based on the selfishness of the individual and immediate gratification or a prolonged sense of ecstacy. All well and good if you do not care to share in the joy of parenting. However, if your simple mind can stay with me for just a moment, scrawny ronny, I shall enlighten with you of the concept of living beyond yourself. Beyond yourself in a way that you have children and raise them in a fashion that requires sacrifice, sharing and a love that you just don't feel with a girl that you have 33% of the time (again - unless you are mormon and you enter the world of sister wives which has almost no appeal to me. I've got 99 problems and a b**** ain't 1.) I have been blessed enough to share the love of beautiful women on a fairly frequent basis. I have also struggled through the ability to "hook-up" when I was a younger man as most people do, so I can definitely appreciate the change of roles where I now have the power and the "beautiful" women no longer do. But I can tell you beyond a shadow of a doubt, that I would trade every future encounter with women for the relationship I have with my children. But you will never get that. Because the self-absorbed "game" you roll (and when you grow up, you will realize it is not game) is predicated on displaying value through two means - money and looks. And you know what ronny? I thank you. It is because of a plethora of schmucks like you that I can walk into a room of women and within minutes gain their favor because I am the antithesis of your internet persona. I am caring, intelligent and funny. And the real way to a woman's heart, libido, etc. is through connecting on a level you will never understand
That's all well and good until one of them gets pregnant or catches a STD and you spread it to everyone else. Or one turns wants to turn it into a monogamous relationship whether you like it or not and your delightful intense foursome turns into a triple homicide with a slice of suicide. Plus, one woman is expensive enough. Girl I'm dating now covers her half of the costs and is agreeable with me when I'd rather do something more budget friendly, but doing that with 2 other women would put me through bankruptcy.
More biology, really. But I wasn't turning it into anything, merely pointing out the aspects of of our reproductive instincts that inform on the scenario you brought up. Like I said, it's not impossible to maintain a 1v3 relationship with no problems...but to me relationships are about long term, and I would be curious to hear how long any of your 1v3 scenarios actually lasted for, because I find it hard to believe that all 3 women would be willing to put up with that over the long haul.