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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If you're drunk and drive your car you're held responsible. You can't be held liable for any legal or binding agreement made while intoxicated however. I'm not sure what your concern is toward?