I think this is a great question.

Sometimes it comes down to how a sub naturally processes and reacts to what is happening and I can understand why someone who naturally doesn't, would feel like they are being fake or acting if they make noises or reacted outwardly. It is a weird thing but I have spoken with other male subs who are the same way as me in that engaging my brain actually drives me much further away from subspace than towards it, so actively trying to give feedback would be a problem for me. What you refer to as being stoic might be me sinking into the experience. In addition, I try to be as disciplined as possible during a session so I am going to stand firm for the next corporal strike rather than flinch or avoid it and am not going to scream/act out like what I see in some online clip in regards to the pain you are inflicting.

However, I also happen to be very lucky because I naturally give off a ton of feedback to the Domme in the ways you specifically mention and my own unique way. As I get close and reach subspace my entire body actually starts to shake and Dommes I play with see this build from light quaking to violent spasms over the time we are playing (90% of the time I have no idea this is happening and have to warn Dommes about it prior to playing with them the first time because they think I might be having a seizure rather than being in the throes of pleasure). I also tend to whimper or let out hard breaths when I really feel things. If not blindfolded, my eyes literally give everything away and all it takes is a Domme to look at them and understand where I am at (besides the obvious indicator that is between my legs).

However, I have to point out that these feedback items are not things that I do in any active way, it is just my natural reaction to the session. In any case, I do feel that cycle of feedback and pleasure from every Domme I have ever played with so I know my natural and very visible reacts drive their enjoyment while playing with me, which in turn drives me even more. I would be surprised if you will find many Dommes who don't love this kind of active feedback while playing.

Where I do fail is that if I am deep in subspace or even just the sub mindset, there is literally nothing you can do to me to make me orgasm and I can only achieve it on my own about 25% of the time (this may not be part of what you do or allow during a session but it has been highly disappointing to Dommes who want to give me that as a reward). Unfortunately, for me, that process resides in the Dom side of my brain and I just can't access it when I am deeply submissive. Maybe a little TMI, but I think it is relevant to a feedback question.

Asp