No, this isn't about sex. It touches on sex and sexuality only because our insane culture thinks that consent is enough to prevent rape; but where the myth of consent really lies is in the world of finances.
We have human brains and imperfect knowledge about our world and our future. Due to this, there is no such thing as a coercion free contract. ALL contracts, supposedly signed in freedom, contain things people need to survive, otherwise there would be no basis for economics. ALL contracts, supposedly signed in freedom, have one party profiting more than the other party, this is why business is profitable.
And that is why consent is a myth- a leap of faith in unjustified trust at best. There is no reason behind it.