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The theory goes that alpha males get all of the chicks.
And, all you have to do to get all of the women to love you is to be an alpha male. And, most alpha males are jerks--actually all alpha males are jerks. So, that's why all of the women are attracted to jerks.
Note that all jerks are not alpha males, so you can't get a woman to like you by being a jerk. The being a jerk is just an after effect. The alpha male is what will make women want you. So, don't try to be a jerk. Try to be an alpha male, and you will naturally be a jerk. You don't have to try.
Alpha male originates from the animal kingdom, where all groups of animals rank themselves in order from alpha to omega.
This is not much different than the social system with men, the only difference being that the hierarchy of men has people at the the same level as each other sometimes, but I'm getting off the subject.
Nowhere is there more proof that women are attracted to the alpha male than in the book 'The Rules(TM) : Time-Tested Secrets for Capturing the Heart of Mr. Right'. This book talks about how to get the alpha male to fall in love with you. It doesn't talk about betas or anything but alphas. It only talks about how a woman can attract an alpha male.
The best book that I've read on how to be an alpha male is 'The System: How to Get Laid Today!'. The incredibly surprising thing about this book is how almost exactly similar this book is to The Rules. The tactics are almost exactly the same in both books, which is surprising, because one book is about how to go to bed with a woman within 15 minutes of meeting her, and the other book is about how to get a man to marry you and love you forever.