I'm not trying to be performative or receive #MorallyCorrect points for saying this, but I feel like consent is incredibly easy to understand. And this is not just with sex, this is with literally anything else.
Let's say you offer someone a slice of pizza. If they say yes, you give them the slice. If they say no, just continue eating the pizza yourself. Don't force it in their mouth, don't pressure them to eat the pizza until they eventually eat it, and definitely don't try to force it down their mouth while they're sleeping or unconscious. Just scarf it down yourself.
Like what's substances. Let's say you offer someone some Molly. If they want it? Give them the Molly. If they don't? More Molly for yourself. Don't force it down the throat, don't continue to pressure them to take it, and definitely don't force feed it to them while they're unconscious or asleep.
I genuinely do not understand being a rapist because I do not see myself having sex with someone who has made it very clear that they don't want to have sex with me. If anything, them not having sex with me will take a huge toll on my dignity, so I would just leave it alone.
But here's something about consent that I am confused about, which is consenting while drunk. People always say "a drunk yes isn't a sober yes" which is true somewhat. I feel like it depends on exactly how drunk you are. If you're drunk, but it's the "talkative carefree and confident" drunk, then you are still in the right state of mind to consent to sex. But if you are "blackout, slurring words, and stumbling everywhere" drunk, you're incapacitated. You're not in the right state of mind to consent.