It's no use saying 'ah but they've never done ballroom' - dance training gives them spatial awareness, body control, directional awareness, use of arms etc etc, so they have tremendous advantages. It's disingenuous to pretend otherwise.
It also means they are not self conscious about "acting sexy and sensual". I remember one celebrity (can't remember who) who said that she felt silly trying to act sexy in front of her husband and children in the audience. I could relate to that. Athletes, newsreaders, anyone who hasn't been to stage school, is going to feel like that.