Well, same with males also. Males also find modern and western girls attractive than traditional girls. But, this is related only to attraction, no commitment. For marriage, no better choice than traditional indian girl with all sanskars and mannerisms. So, its no strange that girls also are attracted towards bad boys just for sake of attraction and not for commitment.
At least in India, it is true that many girls prefer bad boys for romance.. but they always prefer handsome, cheerful and responsible guys for marriage...
Women Cant wait long to have relation on sex alone as it is time consuming to choose the right person beyond certain limits But Bad Boys are abundant and can fill easily. Question is how far these relation are maintained is well known by divorce data.