Regret is not ever rape. I question from what sources you are getting your information if you believe so. What can happen is that someone who was too intoxicate

Regret is not ever rape. I question from what sources you are getting your information if you believe so. What can happen is that someone who was too intoxicated/incapacitated to give consent to sexual activity can make a complaint because sexual activity occurred without voluntary, freely given consent. If you have power, many things can be considered harassment, which is different than assault. It's similar to the reasoning behind prohibiting psychological therapists from engaging in sexual acts with their patients. Really, it's pretty simple. Make sure a person can give consent. Don't abuse your status to obtain sex. Don't rape.