That woman will probably wake up the next day, groggy, confused and naked. Alcohol and romance don't mix Frighteningly enough, things like this happen all the time. If an impaired woman doesn't give consent, it is rape or sexual assault. Women can protect themselves and their friends in a number of ways. When you are out in a social setting, watch your drink - that means, don't take a drink from anyone and don't set your drink down, even for a second.
Drinks are easy to tamper with.
Go to parties with friends and make sure you keep an eye on each other. Employ the buddy system. Don't let your friend leave with someone she just met that night. Know your limits when drinking. Being wasted or passing out leaves you with no control and no defense.