Do Women Need Bad Guys?

Okay is this really what is needed, women to "experience" a bad guy so she knows what a good guy really is?  Or is this license for bad guys to be bad, their rationalization and justification for being bad?  Please.  I think most women are intelligent enough to get when a man is good to her or bad to her.  I don't think you need to have the comparison to get that.  Am I wrong, ladies?  Please feel free to comment!

from:
http://www.searchquotes.com/quotation/A_woman_never_forgets_the_men_she_could_have_had%3B_a_man,_the_women_he_couldn't/390/