I always worry that I am not giving feedback, as I tend to be very quiet, during a session. I do moan and squirm and, well no hiding that erection. I do usually talk after the session about the session, and usually will send an email a few days later after I have had a chance to process everything. I do agree that it is about chemistry, and communication, both verbal and non-verbal. I can actually point to a moment in a session from where it went from a "Good" session, to where it went to a "HOLY FUCK!" (in a good way lol) session. And it turned on a chance look at the Domme and the look of pleasure/lust and control in Her eyes was what did it.