Two strands to this I suppose.
First, do you have secrets (large or small) which you keep from your partner and, if so,, are you willing to divulge them to the CBF Community (and yes, I realise that if you reply then the secret wont be a secret anymore, if your partner reads the Forum).
And secondly, hopefully for a bit of fun, what secrets do you think that fellow Forum members may have. For example, is Crabbit secretly a nice bloke.