Hard for me to talk about really intimate things, like sex, of course....if I do mention it, I'm always trying to use odd, vague phrasing. And my T will say it straight out! Not many topics at all seem to be uncomfortable for her (even su thoughts or si)...she's been willing to talk about anything I have the nerve/courage to bring up.
I had terrible trouble talking about the attachment feelings I was beginning to have a couple months ago, too.......it's hard for me to talk about intimate, intense emotions in real-time (that is, as they are happening!). If it's from the more distant past, somehow I can feel detached from it and it's not so hard to talk about - although some specific details I'd rather not.