What in the world are you talking about? Under expanded rape analysis a person who is under the influence CAN NOT consent, that is IS NOT ABLE TO consent. it has nothing to do with vulnerability or desire or size and strength. If you have sex with someone who can not consent either because of mental capacity, age, temporary impairment, then you have committed rape no matter how much the drunk person, stoned person, under aged person or mentally challenged person wanted to have sex with you.
Most people agree with this analysis when it comes to age or mental capacity. Most people probably agree with this if the person under the influence is completely non-responsive though even this is a bit more problematic. If the person under the influence is capable of responding, then it is even trickier and more people might agree with your personal responsibility argument. The question is where does personal responsibility end?
