Legally speaking, no will more often than not have to be said before it's considered rape (or sexual assault). That doesn't change the fact that even if the victim didn't say no, they are still entitled to feel violated if they didn't want it to happen.
I think you missed the point. I was saying, if you want a man(or women) to stop trying to have sex with you, in a situation where you're say, in bed together, or naked together, you actually need to say no. If he keeps trying to talk you into it, that isn't sexual assault. It's already an intimate moment, and there is already a degree of consent given to a degree of intimacy. If you want the guy to stop trying, you need to actually shut him down.
Now, I don't really even know who this Aziz Ansari guy is. He's a comedian I gather. However, all I see here is a guy trying to have sex. Is that a crime? Did he force her? Did he intimidate her? Did he somehow or another coerce her against her will? He seems to have made it pretty clear he wanted to have sex with her, and she stayed. She knew what he wanted, and she stayed. So again, I ask, did he force her? Did he coerce her?
There are real cases of sexual assault and rape, where people are bullied, and forced into these situations where the person assaulting them has real, definable power over them, and they exercise it. This is a situation no different from going to a bar, getting blitzed, and then having sex with someone you would never normally have sex with and then regretting it. That isn't violation, that's self loathing and embarrassment.
The reality here is, that we've established a climate that IS friendly towards people coming out against sexual assault, and that is good, but in doing so, we've created a climate where people can confuse sexual assault, or violation, with their own POOR decision making. You know what? That's ok too, so long as we define them as such, recognize them as such, and ultimately, shut them down as such. This woman made a bad decision. This Aziz Ansari guy is probably an enormous douchebag who leveraged his fame into getting laid, but he didn't at any point in this story force her or coerce her.
Having this discussion is sad, but it's also important, because there are real women, and occasionally men, who are pressured into sex by bosses, or people who have actual power over them. Participating in something you regret isn't being violated. It's something YOU participated in, perhaps immediately regretted, or maybe the next day, or next month. I regret having sex with more than a few people, does that mean I get to accuse them of sexual assault? Or does it mean I was a dumbass? I think it means I was a dumbass.