Off topic, how does consent and intoxication work if both parties are under the influence, anyway?

Looks at comment section

Yeah... For the sake of avoiding unnecessary toxicity in this hypothetical, let's go with two people of the same gender. Men, women, whatever. They get heavily drunk, end up sleeping together. Next morning, mayhem ensues. What happens? Are both parties guilty? Neither? Does it matter who initiated? Levels of intoxication? Degree of shame and regret?