> I can't think of any example from my previous relationships that did not start with either myself or the other making a move which could later have been construed as assault.
That's funny, I can't think of any examples from my past which could be construed as assault. And I rather doubt you can either; implicit consent is still consent.
> Asking for a written legal waiver before planting a kiss on someone you're passionate about seems essentially where all this is leading
I think that's quite an absurd conclusion. How do we jump from "don't kiss people who don't want to be kissed" to "obtain a written legal waiver"? That's like going "you shouldn't break into someone's house...so you need a written waiver before entering, even if they're literally walking next to you and offering you a drink", because maybe you've misread the situation, and when they said "come on in, but mind the dog" they meant "go away"?
In the real world body language and conversational hints make is very clear what's going on in most cases, and in a small minority of cases when those prompts are misread, there will be a clear "no", and then you apologise and move on.
"Then I went into my own bedroom but Dave followed me there, and that’s when he first propositioned to sleep with me. I said no. I reminded Dave that he knew my then-boyfriend and that we’d just talked about him earlier that night. At this point, I led him to the door and told him he needs to leave. On the way out, he pushed himself onto me to the point where I was backed into a corner, made contact to kiss me..."
Can you honestly read that and, taking the account at face value, go "wow, Dave was just making an honest mistake; he should have been more careful and asked for a written waiver before he forcibly tried to kiss a resisting woman who had repeatedly told him no and was in the process of evicting him due to his inappropriate advances"? Really? Truly? That's your takeaway here?
The problem here, as described, isn't that he didn't get her consent in writing, its that there was no consent at all. These are not comparable things!