folks, i have been made to climax when my domme gave me a countdown from 20 to 1, this was at the end of a session, and i had spent some time preventing a climax so it was quite easy.
Of course, this is a good point... how aroused you are and how long you have been denied will be factors in this. I suppose the question could also be 'can you get a male to go from flaccid to erect to ejaculation with only a word and no physical contact?'