That’s not always true. If someone is bigger than you and is over powering, even if you verbalized them to stop they don’t always do so. You can lock up and be too scared to do anything. It’s not about violence, it’s about control and what people think they can get away with. The part that needs to be taught is to let people know that you can’t talk your way into making a someone else do anything. If they seem uncomfortable, ask about it. If they are, just stop. That’s what consent is. It’s not that hard to ask. Also don’t get offended if they don’t want to either have sex or be touched in a specific manner.