I don't talk sex with my therapist. I would if I thought it were pertinent, but otherwise it would just be sort of embarrassing...she is a somewhat motherly individual...
Is your kink causing you anxiety? Do you feel sex is something you need to address with your therapist in order to make progress?
I agree with bluenarciss about using the web as a sort of unofficial resource. There is an amazing amount of information on the web about an unbelievable range of kinks! I have a truly odd (though harmless) fetish, and was absolutely astonished to discover others on the web who are into exactly the same thing. Sometimes just realizing that there are like-minded people can put your mind at ease.