From Love-shy.com wiki: A wiki for the dating-challenged
A bad boy is a type of man who is highly sexually attractive to women due to his carefree, no-holds-barred, unrepentantly dangerous attitude. Typically, a bad boy has the clothing and social scene to match. He may be physically attractive, though this is not a requirement.
Bad boys come in many different shapes and sizes. They range from bikers, to rock stars, to professional athletes, to actors with an edge. They may range from reasonably clean and legal to outright unsavory, such as prisoners, drug dealers and gang members.
The female attraction to bad boys can be explained by the need to sate urges for danger and unpredictability. A bad boy often does not care what others think, and does things on his own schedule, permitting little interference. This, combined with the danger he provides causes women to chase him relentlessly. An ability to do whatever one wants, even breaching etiquette or societal norms with little consequence signals the high-quality genes of an alpha male. The deep, reptilian hindbrain of a female is magnetically drawn to this.
Personalitists are split on the significance of the bad-boy phenomenon in attracting women. More feminist-opposed personalitists claim that a large percentage of women will go for bad boys, often to their own detriment, while leaving those lacking dark triad genes out in the cold. Feminist-friendly personalitists dispute this as an example of hyperbole, claiming that while women may be attracted to bad boys, they rarely act on such attraction, especially as they age. They claim that most women learn quickly to avoid such men, as they are usually bad news. Meanwhile, women will often dispute the claim that women as a whole see bad boys as attractive.
Looksists often dispute the notion of bad-boy attraction as nonsense, citing myriad examples of good-looking guys with decent personalities who have little problem with women. They will often claim that a person who is a bad boy can do so because he is good looking, and would otherwise not be taken seriously. This is despite evidence that many bad boys are overweight or otherwise physically unattractive.