I'm not going to say that consent doesn't exist - but it's sufficiently ill-defined as a concept that it is somewhat meaningless. What constitutes consent?

If I finally agree to something after being nagged interminably - have I consented, or have I just given in?

At the other end of the spectrum, if someone asks for something which doesn't particularly suit my purposes, but I agree to it as it seems fair enough - is that consent?

One situation seems like it is, the other one probably not. But where is the line? To me, consent seems like a vaguely letter-of-the-law, CYA type of word.