It should be legal consent. You are responsible for your actions. If you get behind the wheel of a car, you are responsible for any damage caused. Likewise with consent. If you can say yes, you should be held just as responsible for the fallout of that choice as any damage caused by drunk driving.
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I agree. It is part of being an adult. If adults cannot handle that responsibility, then they should not be drinking in the first place. However, I would point out that being passed-out drunk and/or given alcohol unaware is -blam!-, since foul play was involved.