Laws regarding sexual liaisons between authority figures and those subordinate to them not only are not archaic, they exist even in the most far left schemes. Like laws regarding theft and assault, they are non negotiable requirements for any society.
You are still incapable of answering the question of how you regard sexual liaisons between adult officers and enlisted, or between adult psychiatric professionals and their patients. As your entire shtick here seems to be that sex between any two adults is okay any time... Explain how that would work.
Is it a crime for 20 yr old and a 30 yr old to have sex, NO!
Is it ILLEGAL for consenting adults to have sex, NO!
Sexual Liaisons between adults in those Professional Relationship capacities are wrong, and constitute an ethical breach of contract, and trust, but SEX is not a CRIMINAL act! You completely miss my point because you got your Namby Pamby on about the morality and ethics of certain relationships and equating these with "The Law".
Any sex between consensual adults is not "OK" anytime because of professional relationship issues and personal violations of trust. But again, not a criminal act!