If a girl's gotten me hot and bothered, and then says "no", I don't immediately lose my erection or something. But me having a boner doesn't mean I'm suddenly ruled by my penis and must do as my penis commands. Girl says no, I back off and figure out what's wrong. I may still have a raging boner, I may get blueballs. But I'm not going to rape her because of either of those facts.
That's where the difference is. Rapists don't care about her, so they satisfy themselves despite her protests. Normal men don't, because we're not rapists. If you're arguing that you can't make that decision because you have a boner, then you're either mentally deficient (not arguing that you are, just ticking a possible box), or you're actually disposed to be a rapist, or you're lying through your teeth for some godforsaken reason.
There are no other options. Every man can choose to back off when a girl says "no". Some of them choose not to.