I am going to put on my therapist hat for a moment.
Any therapist that gratuitously starts asking about sex in anything other than a general way should be avoided at all costs. If it is not part of the problem it should not be brought up in therapy by the therapist.
During an intake I may ask how is your sex life. That is the end of it unless the answer is of concern.
In therapy with someone for gender dysphoria or as a stepping stone to GRS or in order to have a therapist that you have a relationship with after GRS there is no need to discuss sex unless the client brings it into the therapy room.
Now I can take that hat off (yeah!)
Gee, apparently when I took my hat off my train of thought got derailed--who would have thought?

No, sex isn't the problem, it is memory caused by being somewhat chronologically endowed.