A book that I found helpful is The Survivor's Guide to Sex: How to Create Your Own Empowered Sexuality After Childhood Sexual Abuse by Staci Haines

Have you told T that this is something you want to talk about? Maybe just spending a session or two talking about what it might be like to discuss it--the potential for feeling mortified or ashamed, and your past experience of trying to address this issue-- could be a helpful warm up.

I think it is worth it. It's terrible to have a happy and pleasurable sex life stolen from you by your abuser. Good luck!