I would be jealous. But if it was a formal dance thing like a tango dance, I would be okay with it. For the rowdy flirt'n'grope type of dancing place with swing dance and pairdance like that. I'd be more reluctant. On a disco floor I wouldn't mind you danceflirting a little with someone who was clearly aware that we were a couple, but I know these places - give a male a smile and he thinks he got a ticket to your bed right there on the floor. I guess I have been to too many discos.
Worth passing on. If we were out dancing and someone ask me to dance would you let me?