Because I'm not a good dancer. I'm self conscience and have no rhythme. Well, confession time is over, on to my point. This makes me believe that a dance club is a great place to meet people. You could tell who was desperate, horny, faithful, coupled and et cetera.
Slow dances can also bring informaton as well as fast ones.
The people that fool around and joke during slow dances are likely to have fun in a relationship. The serious, formal ones are likely to more traditional. Last, but not least, the people that believe slow songs are to just grab and grope while their partner won't run away are likely to move quickly sexually. I've heard that the Tango is sex while dancing. I guess there was more to it than I thoght.