I already enjoy the forum - thaks to you all for maintaining it.
Initial thoughts (I'm sure I'll post with more!):
I'd like to be able to 'up-vote' a comment without having to post 'I agree with X'.
I'd like to be notified (text / email) if anyone else comments on a thread I have commented on, just so that I can follow a conversation more easily.
I think if any changes are made then the point of the 'Friends' system might need attention. At the moment I accept/ask anyone who has commented / reviewed and who might be of a similar mind. But if there was a 'chat' option I would be more circumspect because I'm happily married and my OH wouldn't like it if I was chatting away to strangers on line about personal things - at the moment the 'Friends' system works as a way of keeping up with the reviews and comments of like-minded folk, so if there is a new look I think it needs to take into account the pros and cons of the current set-up as well as looking at other options.
Sometimes the 'edit' fiunction doesn't work, and sometimes I get signed out so I'm a bit paranoid about saving every sentence, especially if it is a longer post offering advice. This can be awkward.
There is a great deal of difference between the forum headings, which isn't an issue, just something to recognise. But within each one, some questions/threads are fun, some recommend / ask about products, and sometimes people are asking for careful advice about sensitive issues... all under one umbrella. I don't know if there is a way of categorising or describing these which is any better than the one you have in place. Maybe a new look at the different category headings available? Having more headings or sub-headings which are more closely defined might be helpful.
I enjoy chatting about sex and relationships, toys and lingerie etc. I'm comfortable with anatomical details and emotional / sexual descriptions. But occasionally people post things which might be better suited to a different kind of site and it can take the moderators a while to catch these posts, and the threads stay up even if they have been closed for comments. It doesn't happen often. I know the guidelines are already there, but how easy are they to enforce at the moment? I'd be all for the 'sexual happiness for all' strapline without the 'what did you get up to last night' competitive stuff.
I hope some of that is helpful!