Just to be clear, because this is something misogynists like to pick on, both matter. The point of this is that you can't assume their consent just because you do.

Of course, men who don't have experience with not having the power to consent struggle with this idea.

That's true, but if she lacks consent, she should also voice it/make it clear at some point (disregarding obviously illegal power-imbalanced situations such as student/teacher, boss/worker, ...). Someone shouldn't be charged with rape just because their partner, after passionately and vigorously fucking the whole night, says she actually didn't want to the whole time.