Do you talk to your therapist about your sexual fantasies? If you have fantasies about your therapist do you tell him/her about it? Does it help you? How does it make you feel?

My therapist sometimes asked me about my fantasies about him,he asked me how I would like to touch him,what I would like to do with him. I asked how deeply I should talk about this. He said - tell me everything. Do I need to tell him? I want to tell him about my fantasies but it's really hard. I think it could help me if I told him but it's so hard to talk about it.

So I would like to know your experience.