Do you still trust him enough to talk with him about the last paragraph of your post? To confront him with your doubts about the situation? Because these are all extremely important AND useful questions to confront your therapist with.

You mentioned it to be a common occurence for you being confronted with sexuality in unwanted ways : that people treat you a specific way, even though it's not your intention to be treated like this. That's a reality you experience regularly (atleast according to your description) and that you wanted to inquire about. My interpretation of your post is that you were curious for an answer... and the answer shook you to the core.

But to reiterate: it's a (puzzling?) reality you're already confronted with outside of therapy.

Do you want to give this reality room for inquiry in your therapy to work through it? Or is it an absolute no-go to get even close to this topic? If it's the former: what would make you feel safe and comfortable enough to actually engage this reality in therapy? That's the questions you have to answer to yourself and which might give you a hint how you want to react to this situation.

In any case: Curiosity can be a good thing and always trust your gut - but not necessarily your gut reaction!