If there are no consequences to saying no, it isn't coercive. It's the difference between begging and saying "if you don't, I'll threat"

The threat can be minor, something like "I'll tell everyone you're a lousy lay" all the way up to "I'll tell everyone you raped me" or less direct like "I'll stop paying the car payment", or "I'll evict you".

But, as nasty as not taking no and backing off immediately is, it isn't the same as coercion or force. Even being very pushy about it, even using physical contact isn't coercion, though whether or not such behavior should be illegal is an interesting possibility. The difference is whether or not the target of the "seduction" can walk away freely.

If they can, if they can enforce their no and leave, even if they don't exert that ability, or isn't coercive, just douchey.

Now, there is another issue in there. Some people may not believe they can freely and safely exit. That's part of why when someone says no, everything stops, period. Other people may freeze up and be unable to exit, despite having the freedom to, which is another reason we have to make sure that we not only exhibit good sexual behaviors, but teach those ethics whenever needed.

But as far as something being rape or not, that is the ultimate determinant, the freedom of the person to say no, and exit the situation. Legally, it may well not matter if the person nagging the other for sex is aware of the target wanting to exit, but having internal barriers preventing it. That's something laws and juries have to deal with. But for the purpose of discussion like this, that's the line.