I might be off base on this but if this kind of relationship is not ethically wrong for your therapist, no one is going to hold you accountable for his activity, right? I mean, you're the client. No one is going to charge you with an ethical violation, even though you're in training to be a therapist. In this situation, you are the client; you are the one professional organizations are protecting by putting in a set of rules and guidelines therapists are suppose to follow while practicing. So if this was inappropriate behavior, it would be your therapist who was risking the possibility of being sanctioned.

That said, I do think that the video was inappropriate, even when his personality and lifestyle is considered. As for giving the excuse that it was initially a mistake . . . . uh, not kosher. Think about all the men who claim, "Gee, I hit sent by mistake!" when caught sending pictures of their junk (ala Weiner of NY fame). A truly strong, solid and well analyzed therapist would know when he was stepping over the line of too much "sharing". It's fine for him to share his state of mind, to stand in the spaces with you and allowing you to see as much of him as is therapeutically appropriate, but sharing a video of one in a state of undress is a bit over the line, imo. Perhaps the lines are blurring a bit to much for him and he needs to do some reassessment of his professional behavior.

I do think it is entirely appropriate that you are encouraged to talk about you work and your thoughts on how to perform your professional clinical work in new and different ways. These are all things that are important to your personal work in therapy. By-the-way, major congrats on thinking outside the box in your work . It's probably exciting and rewarding to your therapist that he is able to see you grow professionally as well as personally.

I hope you're able to share with him at your next session what your feelings were regarding this current situation. Great stuff to discuss!