Consent, by definition, is voluntary. Additionally, billionaires have more power over poor people than poor people have over billionaires. I take it that we should break apart consensual abilities based on gross income as well? Strong people have more power over weak people, and most men are stronger than most females, so maybe our species should die out. What about politicians, they have more power than the average person, should they also be restricted to having sex only with other politicians? There are power discrepancies all over the place, saying that power discrepancy is the basis of why 16 year olds can sleep with 20 year olds, but 14 year olds cannot, is essentially saying that we need a much, much, much more complex consent system. Sure, and when it does become rape it should be illegal. But when it becomes rape that means there is not consent.