I don't think anything should be off limits. I talked about everything and anything that felt relevant. It took me awhile to talk about certain topics though. It is best to talk about them even if they are just a fleeting thought before they become a huge issue. I learned this the hard way. If a therapist limits you to only be able to talk about certain things then maybe you need to find one that doesn't. Anything is supposed to be okay to talk about.