Someone once put it like this, which I think is a concise explanation:
Boys like to play against their friends.
Girls like to play with thier friends.
I think the trend continues past adolescence, although most really good chess players started as children anyway.
I wouldn't even say that is true since women always seem to be at odds with each other. Have you seen the general vehemence they display towards each other?
Whereas men seem to establish lifelong friendships fairly commonly.
I'm going to stick with the intelligence explanation since it is rooted in solid science and thus far has been refuted by nothing but jokes, sarcasm, and denial :)
I know several women who are often quick to become friends with other women; interestingly the minority of these ladies are from the U.S. One whom I'm close with told me she was out on a girl's night recently and all the girls were talking about how terrible men are. It just occurred to me maybe women have avoided the game for centuries because it has often been considered a man's game and men can act really stupid around women when they put their minds to it. Well Aristotle did say: "Men are good in one way, but bad in many," so we're lucky we have women who are good in so many more ways.
Once Mr. Polgar showed that three girls could compete at the very highest levels of chess, then the argument of male superiority vanished. You, StrengthInPawn, are a dinosaur. Your thinking has died out.