In the latest Banderas movie, he confronts that same problem and solves it by doing a very sexy tango, to show the guys what it's really all about.
You dont have to be a Banderas to appeal to the things the boys are interested in. Boys want to think of themselves as strong, vigorous, athletic- but not particularly as graceful. At least that's my opinion, and I'll bet I could find some personality development studies that would support that. You're a teacher, you should have sources available for stuff like that.
Having said all that, I think that you should attract the boys with the vigorous, athletic dances: swing, salsa, cha-cha, etc. Later on, get into smooth.
Jerry