That argument always confuses me. And pisses me off. If someone wants to drink, they should be able to drink without feeling unsafe to do so. Getting drunk does not equal ‘hey everyone I’m easy now’. I don’t get it. There are always going to be people that drink and get drunk, that’s not where the issue lies.
And really, if you see a girl stumbling all over the place and think ‘woah, she’s too drunk to even walk’ then she’s too drunk to have sex and you should get the fuck away from her. It’s not an opportunity, and anyone that sees it as one is sick.