Sex and sexual fantasies for me are one of the easiest topics in both therapy and life in general. I actually had a reaction to my T's putting the sex topic as something potentially uncomfortable a few times, kinda offended that he assumed I had an issue with the sex talk. I am female and generally more motivated to discuss sex with males (despite being bisexual) and, strangely, if I know the person finds me sexually attractive and I also find him attractive or neutral, that gives the motivation an even extra boost and ease. Sort of a baseline intimate connection on which to build things that may or may not have anything to do with sexuality. I also often find that I tend to use sexuality as a voluntary distraction from talking about/dealing with other areas that are truly difficult for me. It's complex; I believe for most of us the relationship with sexuality is quite complex, if not complicated, with lots of hidden or not so hidden insecure areas. Not surprising at all. I think sex is one of the most complex and dynamic human experiences involving pretty much the full palette of what a human experience can be: physical, emotional, intellectual, developmental, all embedded in a matrix of larger environmental and social factors.

Would it be easier to write about those sexual experiences when you are on your own if talking directly to someone else is hard? Maybe write about it and send/show to your T, so the information will be out there? Then discuss it in small portions in session in the context of your current problems. That way it might be a good "practice" to perhaps also talk with your partner outside of therapy.