That's a general misconception. Even though the book is majorly about lust, it has a whole huge section on social interactions and mannerisms. It is from where people got taboos like not to cut their nails on a full moon and stuff like that.Kamasutra is basically based on a book from India about sensual pleasures between two opposite sexes.
So basically the Topic starter, Mata ji,is saying that the dance is too sensual.