As I've been reading this, I keep thinking of an episode of "Strange Sex" I saw last summer. On the episode in question, they featured a woman who said she could think herself into orgasm. She even taught a class. Towards the end of the show, they plugged her up to an EKG, stuck her in a CatScan, and ran all kinds of other tests on her, just to see if she really was climaxing with absolutly no stimulation. And she was. Her body behaved the same as if she had grabbed a vibrator and gone to town. It seems to me that the conditioning that everyone has been talking about is just another form of thought orgasm. So, just in case anyone was doubting that it was scientificly possible, there you go.

Also, I remember reading somewhere some time ago that men are able to experience orgasm without ejaculation (and there were quite a few men in this woman's thought orgasm class who agreed). So while a man might not be able to ejaculate on command, I think it could still be possible for him to climax at nothing but the sound of his Domme's voice.