Yes it was definately unethical on the part of the therapist. Regardless of who starts the sexual games and relationships it is set down in mental health rules of practicing guidelines and codes of ethics here in the USA that a therapist and a client cannot have any sort of relationship other then therapy based during the time in which that therapist is involved with the client. Your son was the client so that means you are also the client because your son was a minor and the therapist needed your input inorder to treat your child with the appropiate treatment plans so you were considered a part of the package.

Like my son and I. My son was the one being treated at his therapeutic school but as long as the case coding is and was that I have parental rights I cannot enter into any sort of relationship be it friendship or sexual with my sons treatment team members. Its against mental health rules, guidelines and ethics.

That therapist regarldess of who started the sexual games should have ended the phone conversations and reported to their supervisor what was going on and how to proceed from there - removing him/herself from the case or not accepting any phone calls without his/her supervisor present as a witness for documentation to be used at a later date if needed should sexual abuse charges come up.

If I were you I would be reporting this therapist to the therapist supervisor and the governing agency that oversees the breaching of mental health rules, guidelines and ethics in your area. It doesn't matter how long ago the situation happened the therapist can be placed on administrative leave while all his cases past and present are being reviewed and if they deam inappropiate behavior happened then he will lose his certification and or license and will not be able to practice in the area of therapy profession again which will prevent such things happening to other clients and parents - relatives of clients