Normative relationships are based on the assumption that individuals are capable of making decisions for themselves. When that individual is a minor or has diminished capacity, this may not be possible in all respects. Whether it’s a simple communication, a business deal or a sexual encounter, two people can part company with one believing there was mutual consent, the other believing there was no mutual consent.
The frequency with which this happens indicates a societal confusion about just what consent really is. As confusing as this is for adults, it is at least as confusing for youth.