Know the facts about consent and interpersonal violence. Consent is a verbal, sober, continuous, and positive yes. If they have to be convinced, it is not consent. If they are not sober, it is not consent. Consent is freely given and freely withdrawn. This means that consent one time or for one act does not mean consent for every time or for every act.
Be an advocate for others. If you are not seeking ways to be a part of the solution, you are a part of the problem. Do your best to watch out for potentially dangerous situations and intervene when possible, keeping in mind that there are resources for help available at all hours of the day and night.