I'm all for "A ounce of prevention is worth a pound of cure", I believe that women/gilrs should protect themselves by dressing in a more modest manner, not getting so drunk that they pass out, and try having dependable friends to watchout for them in the event someone does try to drug them. That is them being responsible for themselves and their own well being.
However, should they insist on stupidity it is not license for a male to take advantage. Nor is it a crime on their part unless it is underage drinking. Now things get a bit gray, because if she does get intoxicated and do something she then regrets it doesn't really entitle her to cry "rape" on some guy (likely drunk too) she had sex with eagerly enough earlier.