The thing about drinking and driving is that the responsible thing is not to choose not to drive while drunk, as you said, that's stupid. Drunk people can't be expected to not make stupid decisions. The responsibility comes in with making the decision, while sober, to remove from yourself the ability to drive later, knowing that you'll be drunk and stupid then. Don't bring your keys/car, establish a designated driver, that sort of stuff.
Sex is trickier, as choosing to not have sex prior to getting drunk has little relevance to your future drunk self making a different choice.
But as far as that goes, I'm of the opinion that consenting to sex while drunk is still perfectly legit. Wanting to do something is wanting to do something, being too drunk to ignore your desire to sex is not the other persons problem, sober or otherwise. Drunk or not, if you can say yes to sex, then it's fair game for everyone involved.
Sex is trickier, as choosing to not have sex prior to getting drunk has little relevance to your future drunk self making a different choice.
But as far as that goes, I'm of the opinion that consenting to sex while drunk is still perfectly legit. Wanting to do something is wanting to do something, being too drunk to ignore your desire to sex is not the other persons problem, sober or otherwise. Drunk or not, if you can say yes to sex, then it's fair game for everyone involved.