Consent is a narrow legal term that confers a certain sort of standing. It is a concept that a rights-based liberal society cannot do without. But it is also a concept that such a society can do altogether too much with. When we make consent do all the work for us, our political and ethical vocabulary languishes. To say, then, that a sexual relationship was presumably consensual ought to be the beginning, not the end, of the discussion if the issue is the wisdom, decency, discretion, fairness, maturity, and judgment of a president or a colleague or the next-door neighbor.
Consent can do many things.
But it isn't a magical conceptual detergent.