I am beginning to suspect that there is more than meets theeye to their Rumba. I think there is sexual tension there--real rather than pretend, which considering Mark's distinctly non-celeb nature is causing him problems. Also, I very much suspect that his wife may disapprove, which should make things very difficult for him.
Perhaps they had a tiff about it, which is why I think he deliberately made it passionless, whereas we have seen in training VTs that he had certainly gotten the passion act by Thursday.
I do hope this matter can be resolved and that Mark has the full support of is wife in this enterprise, or we will be deprived of the dancer with the greatest potential on the series.