Seriously, it doesn't. I do not see why people who actually thinks that acting all douchy would get them girls. The "bad boy image" thing doesn't work that way. It's more of an attitude kind of thing, rather than being a total douchebag.
Yes, there are a lot of douchebag that gets girls. But they don't get girls simply because they're plain ass douchebags. (-_-) Also, the girls you'll probably get are about the same. As they say, birds of the same feathers flock together. That or the girl is probably just plain stupid. Sometimes, she probably so much in love that she can't even see her own stupidity anymore.
If you wanna attract girls, you should start reflecting about yourself. Start by facing a mirror and ask yourself the question, "What is wrong with me?" You'll bound to find your answer. Because if one person doesn't like you, it's that person's problem. But if there are tongs of people who doesn't like you, then the problem most probably lies with you.
Think about it. It helps, sometimes, to reflect on yourself. It makes the world a better place.