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I don't think it's only an American phenomena. Your example is only about the lowest common denominator of what happens in America but the main thesis of the article seems to work in any setting. The self-centered, narcissistic male usually ends up sleeping with more women than the courteous, humble male. Maybe it's a matter of self-confidence and the narcissist displays it better but women are really bad at discriminating between narcissism and real self-confidence. In the end nobody likes a wimp with low-self esteem but it seems that being an asshole is a sure way to imitate confidence.